Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f784ffff73697a…

MALICIOUS

PDF

45.6 KB Created: 2020-08-13 16:46:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bda620dc5fc09d18abf981321e4e642a SHA-1: c3602d16f010764dd438b6fa5db9666687573b9a SHA-256: 67f784ffff73697a742d5c9993df9235baa7f4d945855709236fe1abe406213c
174 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to external PDF files, a technique often used for SEO spam or to obscure malicious redirects. One critical heuristic identified a link to known malicious redirector infrastructure at `ttraff.ru`. The document body, though heavily obfuscated, also contains this URL and other URLs hosted on Shopify, suggesting an attempt to disguise the malicious intent with seemingly benign content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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=benim+hocam+tyt+co%25C4%259Frafya+ders+notlar%25C4%25B1+pdf
    • http://files.centralcoastrxfirecouncil.org/uploads/1/3/1/1/131163898/d89c07b2.pdf
    • http://files.westlakeffa.com/uploads/1/3/1/3/131383541/sarolunilip.pdf
    • http://files.ourhousecallvet.net/uploads/1/3/1/8/131857071/semosi-kimixasobal-baxokuw.pdf
    • http://files.annishealinggarden.com.au/uploads/1/3/0/7/130776864/kuxafixogudaruwuje.pdf
    • http://pokebiba.hikingforthescaredycat.com/uploads/1/3/0/7/130775162/cd6026.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/wilumajapine.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/xuwuvedalolavotidexetugom.pdf
    • https://cdn.shopify.com/s/files/1/0428/9154/2681/files/buwijonijav.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/49726552648.pdf
    • https://cdn.shopify.com/s/files/1/0433/9400/7191/files/movulufuninaboxoxak.pdf
    • https://cdn.shopify.com/s/files/1/0431/9304/1053/files/95946799714.pdf
    • https://cdn.shopify.com/s/files/1/0430/8205/5842/files/5793360466.pdf
    • https://cdn.shopify.com/s/files/1/0433/6523/6895/files/zizurunabeveje.pdf
    • https://cdn.shopify.com/s/files/1/0436/0860/4829/files/menabik.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_off00006ca4.bin
d02358994b6119da4a3ad624a4f591448dbbf96683ce07335ca04a7995711672		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CA4 5808 bytes
font_01_sfnt_off0000803c.bin
ac9e481999a17b63e0a820a2bff268361da438555913243d386fd15ae051797b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x803C 11280 bytes

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