Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f05f912503c5b06…

MALICIOUS

PDF

53.1 KB Created: 2020-08-02 10:04:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dc48329a5a443aa929d363897b6ebffd SHA-1: b6e851d06a0c042fd85caf8b059bd667b9bcc87e SHA-256: 0f05f912503c5b06b588668393153bf12c1b8d9bc7e1d6ab790d987d4c5292a3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that are part of a link farm, with one critical link pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains a URL that appears to be a lure for a 'Mercury outboard manual pdf'. The presence of numerous external links and the ML classifier's high confidence score indicate a malicious intent to redirect users to harmful 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://ttraff.ru/pify?keyword=mercury+outboard+manual+pdf
    • http://files.jessicanye.com/uploads/1/3/1/6/131607810/dipadezasijusadet.pdf
    • http://files.lynneusingerinteriordesign.com/uploads/1/3/1/3/131378776/janenogatoje-wumukoxemaf-zinosolome.pdf
    • http://files.gmckillington.org/uploads/1/3/1/4/131453902/3573926.pdf
    • http://files.remixworkouts.com/uploads/1/3/0/7/130775772/9f11a2b1f293.pdf
    • http://files.lynneawashburn.com/uploads/1/3/0/9/130969967/95f5f5ef.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0434/7589/4422/files/71022529142.pdf
    • https://cdn.shopify.com/s/files/1/0428/8030/3263/files/77578680479.pdf
    • https://cdn.shopify.com/s/files/1/0427/6636/8935/files/nuxuvakifilizugawopen.pdf
    • https://cdn.shopify.com/s/files/1/0432/2492/4319/files/lufibaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/1057/2967/files/kexadaboladu.pdf
    • https://cdn.shopify.com/s/files/1/0429/2670/2755/files/99357861908.pdf
    • https://cdn.shopify.com/s/files/1/0429/9862/8501/files/61735831279.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdf
    • https://cdn.shopify.com/s/files/1/0430/4466/7553/files/19616086697.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000842f.bin
f53f01be20940d619e04c2013e7fca682b0c2139891a94f25ad60813898c370b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x842F 5204 bytes
font_01_sfnt_off000095cf.bin
ceda4976f9f746913fad93bc8113f2651dc728818bd107202c895906a6b0ec5a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95CF 10392 bytes
font_02_sfnt_off0000b94f.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB94F 4324 bytes

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