Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e176a6693b7bb3a…

MALICIOUS

PDF

34.0 KB Created: 2020-11-09 14:13:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 10af441b2a05dc89907e91bba91a350d SHA-1: bbcea50ff838d7e0bad3317512c5a8b953e4fbd3 SHA-256: 6e176a6693b7bb3a5bfd794050fc2a05e40bfabeb77e7d640f163ef0b670b9f3
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many pointing to what appears to be a link farm designed for SEO manipulation. One prominent link, https://cctraff.ru/123?keyword=r+r+auto+sales+mi, is identified as a malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body itself is heavily obfuscated but contains references to URLs, suggesting an attempt to direct users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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://cctraff.ru/123?keyword=r+r+auto+sales+mi
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/80a2dd.pdf
    • https://notapogixunimo.weebly.com/uploads/1/3/4/3/134363186/disas.pdf
    • https://cdn-cms.f-static.net/uploads/4366057/normal_5f8707e5238e9.pdf
    • https://medizagokitoni.weebly.com/uploads/1/3/2/3/132303310/c32f00a4.pdf
    • https://fupopafesuz.weebly.com/uploads/1/3/4/4/134443157/4876342.pdf
    • https://penulikadima.weebly.com/uploads/1/3/1/4/131482887/9321557.pdf
    • https://sowofinonapira.weebly.com/uploads/1/3/4/3/134361296/4350392.pdf
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5fa83b64a9101.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nazekisigiduz/how_to_measure_anything_in_cybersecurity_risk_1st_edition.pdf
    • https://s3.amazonaws.com/susopuzupure/sasajite.pdf
    • https://s3.amazonaws.com/zuvovoxigumuz/76551967713.pdf
    • https://s3.amazonaws.com/ritoma/anaplasma_platys.pdf
    • https://s3.amazonaws.com/zurovajij/fawn_lake_campground_ny.pdf
    • https://s3.amazonaws.com/sojuravewi/75267233070.pdf
    • https://s3.amazonaws.com/tizowodifi/the_lightning_thief_movie_scene.pdf
    • https://s3.amazonaws.com/sulasatevirexo/summoners_war_monsters_tier_list.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000484c.bin
330eacdeb62995fa2bcd3b1758fcdab39f9442f2614a375f569b0394868b8477
pdf-font-stream PDF embedded font (sfnt) at offset 0x484C 4836 bytes
font_01_sfnt_off000058a5.bin
b42e1f04044ae29e5f6fd74b35c0a121193473c43a7dd5376521f6a32ecaf539
pdf-font-stream PDF embedded font (sfnt) at offset 0x58A5 10168 bytes