Malicious PDF — malware analysis report

Static analysis result for SHA-256 045c604366c65acf…

MALICIOUS

PDF

91.2 KB Created: 2020-10-23 08:19:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2020-12-28
MD5: 850310bfea231b97c7a858a58a7ed95c SHA-1: 282626290ef0179ed317d9cbb637420add5c8db9 SHA-256: 045c604366c65acf202d93e47e466569ca74a91078c1845726f3a079f1883f85
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded links, with several pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. The document body contains garbled text and a URL, suggesting an attempt to disguise the malicious links or manipulate search engine results.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.com/123?keyword=main+aapko+kya+pasand+hai In PDF document text
    • https://cdn-cms.f-static.net/uploads/4377642/normal_5f8a676d0a72d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373788/normal_5f89d9a22b051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f8a426fd37f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366321/normal_5f8eb64d330e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366655/normal_5f8885fa7e1ea.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365551/normal_5f873bb37ae01.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368782/normal_5f8d441426579.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367017/normal_5f87e2678764b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378404/normal_5f8fbf4a095fb.pdfIn PDF document text
    • https://wefamojugibe.weebly.com/uploads/1/3/1/1/131164519/kaven_lidotobin_robisud_tepefobinijowaf.pdfIn PDF document text
    • https://lowizozexide.weebly.com/uploads/1/3/0/7/130776176/4008283.pdfIn PDF document text
    • https://kilutiwoxit.weebly.com/uploads/1/3/1/6/131636983/1737864.pdfIn PDF document text
    • https://pudegubazamase.weebly.com/uploads/1/3/1/1/131163945/56417df19.pdfIn PDF document text
    • https://mixorone.weebly.com/uploads/1/3/1/4/131438240/pekukipuvi.pdfIn PDF document text
    • https://korodaziso.weebly.com/uploads/1/3/0/7/130740443/mufalasuborapenatax.pdfIn PDF document text
    • https://genigudepa.weebly.com/uploads/1/3/1/0/131070712/bekalan.pdfIn PDF document text
    • https://nanorobudilason.weebly.com/uploads/1/3/0/7/130775181/d28701f.pdfIn PDF document text
    • https://saxexowiki.weebly.com/uploads/1/3/0/9/130969873/fakiva.pdfIn PDF document text
    • https://xebikazogede.weebly.com/uploads/1/3/2/7/132740990/5509582.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375908/normal_5f91a034e428c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387699/normal_5f8e51b0e531a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372753/normal_5f8bcb5dbbd6b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368475/normal_5f878b63cec38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379855/normal_5f8e585fc3985.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/1157ac7c-bf12-477a-98ba-99a3c7a96914/limiting_and_excess_reactants_worksh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86683269-8e26-40d1-95b2-aa531367442b/79562974662.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a3f685d1-7b41-49eb-9248-29a514426eb1/xeresowutora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b59d3e9-07c5-49b0-b55b-047d092f43ca/76286592543.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6b6d341-cc16-4706-be9e-b6af616cd3c7/44530500081.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off00010c64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10C64 29112 bytes
SHA-256: ee82d2651f2ecbbba404534dbb6c3be2cbfc5247792437774ff32ee2000029c7
font_00_sfnt_off00008ba1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BA1 5088 bytes
SHA-256: d8286373b1bd3aa035369b2baa58b0df06b7f1d6767bd2964d4795c97dbc2a86
font_01_sfnt_off00009cf4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9CF4 3720 bytes
SHA-256: b91f3c26f37c28538ed09035cbea6f9221827f1e30b50c452f08cc820bcc167b
font_02_sfnt_off0000a850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA850 19940 bytes
SHA-256: 354938ca133be33a42c07aecabda0823c5f420cb4a9e4e7ef1dda6c4cf065f9e
font_03_sfnt_off0000e527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE527 11620 bytes
SHA-256: de760a0b98546fad3576180370ccdd275fb7fe0d0908b22fefc50411e83ded19
font_05_sfnt_off0001404c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404C 8876 bytes
SHA-256: 1b5b02aa9a20b85d6cab7466ef7367d37812408d45d9cdc06400a5e18a3be8eb