Malicious PDF — malware analysis report

Static analysis result for SHA-256 82dc829429895761…

MALICIOUS

PDF

50.3 KB Created: 2020-08-04 03:13:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06b072382db25c6ca4d89a634d558a6a SHA-1: e43d1e432130c9861d4840a9776b0cc2776ecf83 SHA-256: 82dc829429895761e4ea91474059037c624bc5e9a0ba24aea22d31949931bf54
154 Risk Score

Malware Insights

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

The PDF contains numerous links, with one identified as a malicious redirector. The document body, though heavily obfuscated, includes a URL that appears to be part of a link farm or SEO manipulation scheme. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the presence of a malicious redirector and a large number of external links suggests an attempt to drive traffic to malicious infrastructure.

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=castrol+edge+titanium+fst+5w30+c3+pdf
    • http://files.monarchaccountinggroup.com/uploads/1/3/1/6/131606069/zemizevagafatu.pdf
    • http://gulinas.recoverycafelafayette.org/uploads/1/3/1/3/131398360/fujukameku-mizejunuloz-netumidutamej.pdf
    • http://files.monacannation.com/uploads/1/3/0/7/130739564/kigenabig_dofuti_xadaneva.pdf
    • http://files.nyelaw.org/uploads/1/3/1/6/131636632/wazinibofoluwij-xoxazoxow-sedisi-pitinavemiv.pdf
    • http://files.everythingmattersfilm.com/uploads/1/3/0/9/130969562/a1468dc97.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/0903/2863/files/vogixiragisakipuxogasu.pdf
    • https://cdn.shopify.com/s/files/1/0429/8624/2209/files/ragopasi.pdf
    • https://cdn.shopify.com/s/files/1/0437/1637/8773/files/90076023993.pdf
    • https://cdn.shopify.com/s/files/1/0436/9665/2442/files/evil_angel_password.pdf
    • https://cdn.shopify.com/s/files/1/0429/2175/4787/files/292603011.pdf
    • https://cdn.shopify.com/s/files/1/0433/3728/5797/files/86439614614.pdf
    • https://cdn.shopify.com/s/files/1/0433/2955/2552/files/discord_line_through_text.pdf
    • https://cdn.shopify.com/s/files/1/0434/0681/9493/files/86042659215.pdf
    • https://cdn.shopify.com/s/files/1/0437/8230/7989/files/60972428707.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1676/files/52199138275.pdf
    • https://cdn.shopify.com/s/files/1/0435/9471/1203/files/dobagepor.pdf
    • https://cdn.shopify.com/s/files/1/0434/0449/2957/files/lajuditagagowerufa.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_off000072cc.bin
cc07d1777f28e5645d1b1c10c3a3ea5059d5d41a8cffa4d9de6090921461a678		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72CC 5900 bytes
font_01_sfnt_off000086e1.bin
8b699bf03c15dd78187378ca8b621fea4228895b8b570ccd0a477068ffb5a32e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x86E1 17872 bytes

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