Malicious PDF — malware analysis report

Static analysis result for SHA-256 63a77d068d7545be…

MALICIOUS

PDF

43.0 KB Created: 2020-08-08 17:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 978c22a5c8c551e3be43d4994c7e79c7 SHA-1: 163801c9dfe76829b96b04721084b5c3b7a8f296 SHA-256: 63a77d068d7545beccbeaab8cfdb2b16d3bbe7e3a0a09b9e51a0bab25155d5d7
154 Risk Score

Malware Insights

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

The PDF contains a link that redirects to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for free English course materials. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links points to a link farm tactic.

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=cours+d+anglais+gratuit+%25C3%25A0+t%25C3%25A9l%25C3%25A9charger+pdf
    • http://files.eaglecreekwinery.com/uploads/1/3/0/9/130969580/laledalavo.pdf
    • http://zunakerol.savememagnets.com/uploads/1/3/1/4/131407089/nalirerusode-wixovelowitoxax-xagabuwufa.pdf
    • http://files.philthyturtle.com/uploads/1/3/0/7/130776250/9344177.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0436/2724/9826/files/bakimedolexenuvilosuveril.pdf
    • https://cdn.shopify.com/s/files/1/0434/4135/6967/files/dictionnaire_anglais_franais_larousse.pdf
    • https://cdn.shopify.com/s/files/1/0439/0905/4619/files/44442169108.pdf
    • https://cdn.shopify.com/s/files/1/0432/8800/2710/files/goanimate_comedy_world.pdf
    • https://cdn.shopify.com/s/files/1/0430/2523/6121/files/22819033906.pdf
    • https://cdn.shopify.com/s/files/1/0427/9474/6023/files/80684240407.pdf
    • https://cdn.shopify.com/s/files/1/0431/5630/8123/files/jitetasususer.pdf
    • https://cdn.shopify.com/s/files/1/0431/6656/4507/files/temuga.pdf
    • https://cdn.shopify.com/s/files/1/0432/0047/9391/files/32824067844.pdf
    • https://cdn.shopify.com/s/files/1/0428/6644/2406/files/timotekebupojupaxezojabi.pdf
    • https://cdn.shopify.com/s/files/1/0427/9032/2342/files/nepok.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/3652224693.pdf
    • https://cdn.shopify.com/s/files/1/0434/1586/3447/files/27115308677.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_off000064e7.bin
ff29e4ed845edd0f0b98846004ad611f2a91303244464175cbc51647fc31e98f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64E7 5696 bytes
font_01_sfnt_off00007772.bin
a1d33880f1d36eda4a0c750d3b8a1ee832a9c9d639b938a83bfd18d0e34253a2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7772 11748 bytes

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