Malicious PDF — malware analysis report

Static analysis result for SHA-256 7089a9c55d846d0c…

MALICIOUS

PDF

43.9 KB Created: 2020-11-06 05:34:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 1182d3826f563f99b35f0288680f40eb SHA-1: a2690fbbb41231a9c6fa5bccf81ae4baa37c60a7 SHA-256: 7089a9c55d846d0cf42a7003648a9fa4866985ef2e9914887599465775d400f4
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF document containing a large number of embedded links, many of which point to disposable hosting services or known redirectors. The primary heuristic firings indicate this is a malicious link farm, likely designed to either host SEO spam or redirect users to malicious content. No scripts were extracted from this sample, but the extensive link farm suggests a phishing or SEO manipulation attack.

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=ancient+china+map+worksheet+history+gal In PDF document text
    • https://weropejo.weebly.com/uploads/1/3/4/3/134321986/4311483.pdfIn PDF document text
    • https://girenofozajete.weebly.com/uploads/1/3/4/4/134476001/vaxunufukinuwi_dejad_walalax_xelelusaxatuzo.pdfIn PDF document text
    • https://pevinuwipe.weebly.com/uploads/1/3/0/8/130873962/b1e62206.pdfIn PDF document text
    • https://pukaxonimuno.weebly.com/uploads/1/3/4/4/134435323/8e620bda.pdfIn PDF document text
    • https://zimiduninu.weebly.com/uploads/1/3/1/6/131637103/duxexezuturoborex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450907/normal_5f9e9f0c48f73.pdfIn PDF document text
    • https://dekekutema.weebly.com/uploads/1/3/4/4/134440935/3f63cc7e8c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368964/normal_5f887983c8499.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/8309ec54-44bb-4bd6-bfd1-49a1c35d70e7/dowozovelabowukonabi.pdfIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/17_boogie-_woogie_blues_piano_solos_vol_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4c0802e7-5bf9-4956-921f-84beb8a731f6/fundamentals_of_software_engineering.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b2347f2-56cd-4f85-af6b-a55b82c45a1e/diablo_3_beginner_guide_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/tamobalasu/lennox_13acx_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d060d9aa-581c-435f-bab6-49fe8f3f7c9e/gumomipowomof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdeb80d5-c31e-4ac6-99ae-8daf4e20b36b/sony_car_stereo_manual_download.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_off0000686a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x686A 5596 bytes
SHA-256: 6b10e5df8bd300f8f08e58f277bc7fb692c32fd133fa44c1e2c6d1fd80f69986
font_01_sfnt_off00007b5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7B5E 12276 bytes
SHA-256: 8e035f7237f46c06c590f240675d2fd10a3c51ad8666684b53382b6eac72765d

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