Malicious PDF — malware analysis report

Static analysis result for SHA-256 5af8bea8339a74da…

MALICIOUS

PDF

46.0 KB Created: 2020-08-11 04:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d677afe67c482d14e9585239e39274db SHA-1: 38dc9eda4bd6709933c40f2dd7448c3f456e0a96 SHA-256: 5af8bea8339a74da07b89c8a89dbfc74360d75333cd240bd5f842ae790baea72
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure (ttraff.cc), which is likely the primary malicious objective. The ML classifier also strongly indicated maliciousness.

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.cc/pify?keyword=bisection+method+theory+pdf
    • http://files.guilfordfoodbank.org/uploads/1/3/0/7/130740323/bepowazenujozo.pdf
    • http://damav.friendlysedanservice.com/uploads/1/3/2/6/132683014/e60cb326dd9b14.pdf
    • http://files.connectexperiencewrite.com/uploads/1/3/0/8/130813755/14386.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8589/7627/files/wavabemojim.pdf
    • https://cdn.shopify.com/s/files/1/0438/0311/5680/files/munchkin_boilers_troubleshooting.pdf
    • https://cdn.shopify.com/s/files/1/0439/3825/0910/files/herobrine_s_mansion_2.pdf
    • https://cdn.shopify.com/s/files/1/0432/7568/1947/files/altura_uterina_segun_edad_gestacional.pdf
    • https://cdn.shopify.com/s/files/1/0430/6999/7217/files/nasawimukitifogi.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/9284441163.pdf?v=1594212706
    • https://cdn.shopify.com/s/files/1/0438/7959/6187/files/putatog.pdf
    • https://cdn.shopify.com/s/files/1/0435/3005/9940/files/40134521918.pdf
    • https://cdn.shopify.com/s/files/1/0439/4863/8363/files/mamozivikebu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9097/5647/files/consumer_buying_behaviour_thesis.pdf
    • https://cdn.shopify.com/s/files/1/0431/0731/9974/files/38192116107.pdf
    • https://cdn.shopify.com/s/files/1/0428/8158/1209/files/63857944521.pdf
    • https://cdn.shopify.com/s/files/1/0433/4115/2406/files/65646655167.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aa6.bin
828366dc4b69b4efb6b3cd93298a9435884a0f33309432b66bc7910ab252aafe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA6 5304 bytes
font_01_sfnt_off00006c8a.bin
3878eef5c2b64160e88d1e081cb7a4956680cc7b8efa62924648ad8f2d6088cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C8A 12644 bytes
font_02_sfnt_off000095c7.bin
fb10e5badbbf29d6a05184c763452604a6d256f7c208a2bb674868c670b14a78		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95C7 16144 bytes

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