Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d9fecbffb3dd8e…

MALICIOUS

PDF

42.3 KB Created: 2020-08-05 15:13:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed5e2f991c7cc5de69c90679cb9d99d4 SHA-1: 4dcd3e343fbf364fbc0dbf600bdfa63d98944e4c SHA-256: 66d9fecbffb3dd8efbc5f9b8f4f54852bbdbeed459e0eb6b6686e6c7ab315715
162 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including a critical finding for linking to known malicious redirector infrastructure. The document body, though partially corrupted, contains text suggesting it is part of an SEO poisoning or link farm strategy, presenting itself as a search result for medical guidelines. The primary malicious IOC is the redirector URL, which likely leads to a further stage of the attack.

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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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=american+college+of+gastroenterology+guidelines+management+of+acute+pancreatitis+pdf
    • http://files.mb-freestyle.com/uploads/1/3/1/4/131453124/gegukogoloro-kakopetedejes.pdf
    • http://fufojone.mydnorco.com/uploads/1/3/0/8/130874493/475270.pdf
    • http://files.pureperspectives.com/uploads/1/3/1/3/131382808/5e61073c65db.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/1734/6965/files/30726046925.pdf
    • https://cdn.shopify.com/s/files/1/0433/9384/3358/files/jemunamovimak.pdf
    • https://cdn.shopify.com/s/files/1/0434/3237/8517/files/92826302750.pdf
    • https://cdn.shopify.com/s/files/1/0434/3303/3880/files/94600382960.pdf
    • https://cdn.shopify.com/s/files/1/0439/1269/1867/files/35591870114.pdf
    • https://cdn.shopify.com/s/files/1/0431/8186/7176/files/16331014185.pdf
    • https://cdn.shopify.com/s/files/1/0437/4301/9159/files/ielts_reading_test_sample.pdf
    • https://cdn.shopify.com/s/files/1/0429/7159/4911/files/67699028722.pdf
    • https://cdn.shopify.com/s/files/1/0430/9634/2695/files/1654970865.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/rasebiv.pdf
    • https://cdn.shopify.com/s/files/1/0432/2990/5058/files/gijepevopititufabajuda.pdf
    • https://cdn.shopify.com/s/files/1/0429/1392/3228/files/wanubupew.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_off00006619.bin
7f47dc6c0e8797954966b55dbf6faf50df9b4799f3cb5de82c82084706e9da2b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6619 5564 bytes
font_01_sfnt_off000078fb.bin
76d3b0ce062f31bb43af1a566870c50bfd4356786b2d22e7dc133ce814b60612		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78FB 10252 bytes

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