Malicious PDF — malware analysis report

Static analysis result for SHA-256 18e8d82d65c6ea45…

MALICIOUS

PDF

46.0 KB Created: 2020-08-07 17:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cb58446c5fa47f4358318c807b271a03 SHA-1: 4faa0c9cbd5d9352728dc38350e6a21b3b10d984 SHA-256: 18e8d82d65c6ea4526a901a8b46cda474310e99f8bc871e33ce4777c95d70d56
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'ttraff.com'. The document body, though heavily obfuscated, contains the same URL and appears to be a lure for a medical topic. The presence of numerous other PDF links suggests a link farm or SEO poisoning attempt, further indicating malicious intent.

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.com/pify?keyword=hernia+del+hiato+esofagico+pdf
    • http://sipulew.fringedbenefitsdesign.com/uploads/1/3/2/6/132681670/7746721.pdf
    • http://files.sjsheds4u.com/uploads/1/3/1/8/131872079/869963.pdf
    • http://files.mosaicartsfestival.com/uploads/1/3/2/6/132683080/dunitotabepaxu-kaguxibidu-lapusexavemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0432/4609/2445/files/all_weather_strategy_portfolio.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/motedo.pdf
    • https://cdn.shopify.com/s/files/1/0432/4976/2459/files/solution_annealing_process_stainless_steel.pdf
    • https://cdn.shopify.com/s/files/1/0434/4968/0032/files/99009710155.pdf
    • https://cdn.shopify.com/s/files/1/0427/7298/8071/files/faxunakenutebekeza.pdf
    • https://cdn.shopify.com/s/files/1/0438/1910/6461/files/bleacherreport_com_nba.pdf
    • https://cdn.shopify.com/s/files/1/0430/4853/4167/files/sezaginivukikipededatetiw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3785448733.pdf
    • https://cdn.shopify.com/s/files/1/0431/2167/2356/files/nolagoverifisegakoxafalo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8894/5064/files/acrobat_dc_cannot_edit.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_off000075f3.bin
bf30e340bc8dfa1a54e87d4e3cab728eaee6b3c5b44df2a4fb182b967afb1216		 pdf-font-stream PDF embedded font (sfnt) at offset 0x75F3 5380 bytes
font_01_sfnt_off00008838.bin
9c26374619413d19045fe64ee672851d5bf99f8615fea0f0cafeb83a3a5e13c0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8838 10340 bytes

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