Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87a80db3d6a9781…

MALICIOUS

PDF

46.8 KB Created: 2020-10-23 07:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 7469d689561e43ae3efc1f9d8f6f2b59 SHA-1: 52fda547e6f19251bb8e88f78e6a287af1078394 SHA-256: d87a80db3d6a9781b32c19b5f7b6f8de5d508c3b1885d041db894b4e138facf1
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that is also present in the heuristics, suggesting a deliberate attempt to drive traffic to malicious sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ggtraff.ru/123?keyword=exhaust+wrap+installation+guide In PDF document text
    • https://tivakoxidedopa.weebly.com/uploads/1/3/0/7/130776298/midun.pdfIn PDF document text
    • https://tovozilulu.weebly.com/uploads/1/3/0/8/130873983/9670698.pdfIn PDF document text
    • https://roninuvanajeg.weebly.com/uploads/1/3/1/3/131379749/vupiwavazewirobodir.pdfIn PDF document text
    • https://tunimesepet.weebly.com/uploads/1/3/1/4/131455680/falavenetomakozifu.pdfIn PDF document text
    • https://jawasolasazilem.weebly.com/uploads/1/3/1/3/131379174/wewebunovemerifabo.pdfIn PDF document text
    • https://xavoxoxuda.weebly.com/uploads/1/3/1/3/131379246/buxilojax.pdfIn PDF document text
    • https://baletepo.weebly.com/uploads/1/3/0/7/130776023/8005743.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/nasavupu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/159907e6-411e-45be-a61f-4d625e425a01/pofavenolomudesogexukudi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f620a7-fded-4938-aa16-7ce46f44a2a7/walamaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2509ef44-7b16-42f1-9c97-c55dca09405a/93829786698.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f07fe65e-3a23-4d0b-827e-fdd28f0a8bf5/60795978550.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/caf94ecb-872d-4dbb-9507-9fc700403495/37497295815.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9d98c0c-0f2b-4dba-b9a4-9c1baae7553e/3350253611.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0494/5952/7847/files/vimejimuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1270/1854/files/infinite_design_apk_full.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3806/4296/files/sapphire_secure_iptv_apk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/779862ff-3e5d-4050-93f8-82cb231cf5df/92370202462.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c0d2bede-20b7-49a0-9986-9264c4c6c164/16880962375.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e009cbd-147d-40f8-9ec3-cc9bfadc42da/tezokixipipas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96f0f99e-44ef-4db7-a71a-3f7ca887a185/55653826652.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000077e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x77E0 5340 bytes
SHA-256: 3ab056fe5ccdf7a84f40307558196195accd97ac17db87303f03ad3a0a08403b
font_01_sfnt_off00008a16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A16 10436 bytes
SHA-256: eee898956b298563c1f09612424df18e03d1f0c5d0fb1210d897f73f6328dff2