Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f351c0979e51fb5…

MALICIOUS

PDF

36.4 KB Created: 2020-08-01 14:26:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da22b1ee81560c61cf09d10bb5297e10 SHA-1: fd45269e43908b137f7b16fe7e399b2467696ef6 SHA-256: 0f351c0979e51fb58b17203ee5fb9c74af14e021d34233d009e816b5ea69ebdc
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, suggesting an attempt to lead the user to a malicious site. The document body, though heavily obfuscated, contains text that appears to be a lure related to "1984 questions and answers". The presence of numerous external PDF links, many hosted on Shopify, indicates a potential link farm or SEO manipulation tactic to distribute malicious content. No scripts were extracted, but the primary malicious behavior is the redirection to a harmful URL.

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.com/pify?keyword=1984+questions+and+answers
    • http://files.edmundzygowski.com/uploads/1/3/1/1/131163914/95a7804da766b.pdf
    • http://files.drzamps-zgear.com/uploads/1/3/0/9/130968984/jexan-dunibodusiguje-gegogokazu.pdf
    • http://files.shipanna.com/uploads/1/3/1/3/131379213/vekajisuvokiz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0434/8693/7253/files/sanunutisojefolemukinadi.pdf
    • https://cdn.shopify.com/s/files/1/0429/6451/7023/files/wuzetajinokopi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6132/1634/files/rumetapoduxow.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/merorefala.pdf
    • https://cdn.shopify.com/s/files/1/0432/7279/8373/files/57824792124.pdf
    • https://cdn.shopify.com/s/files/1/0429/9633/4753/files/18208636091.pdf
    • https://cdn.shopify.com/s/files/1/0433/8089/9991/files/56939226491.pdf
    • https://cdn.shopify.com/s/files/1/0434/2261/3654/files/23226973269.pdf
    • https://cdn.shopify.com/s/files/1/0437/4170/8453/files/64815686928.pdf
    • https://cdn.shopify.com/s/files/1/0435/0086/3643/files/33987600518.pdf
    • https://cdn.shopify.com/s/files/1/0439/3687/4651/files/ralufubebuwiparataf.pdf
    • https://cdn.shopify.com/s/files/1/0429/5458/8316/files/gafasusaladilulixaj.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_off00004fc8.bin
82101bb0b6e09ea5bb0dac5b8a2fae4725581bf35d0c97cb3f1dbd8a765c4bb1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FC8 5400 bytes
font_01_sfnt_off00006246.bin
56c27290b9bf10fc38a7868adbd0863c9a5b3c560577b61f257cec87f548cece		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6246 10216 bytes

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