Malicious PDF — malware analysis report

Static analysis result for SHA-256 790b02b69a21cde5…

MALICIOUS

PDF

144.0 KB Created: 2020-08-15 08:52:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 30a4356ce2e36c440d1359a48543726b SHA-1: 17f55c62b2fd580dcda700e644ad9dd7e32d8c15 SHA-256: 790b02b69a21cde560d496d02e15286ede67e7be7169f7c9b80f6bca78c6d85a
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Heparin induced thrombocytopenia guidelines 2018' and a URL that aligns with the malicious redirector finding. The presence of numerous external PDF links suggests a link farm or SEO manipulation tactic, likely to obscure the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.ru/pify?keyword=heparin+induced+thrombocytopenia+guidelines+2018
    • http://files.ncam.ac.nz/uploads/1/3/0/7/130776788/a94fe6a1c2f25a.pdf
    • http://nakigisu.blacqueen-ent.com/uploads/1/3/2/6/132696323/7989910.pdf
    • http://files.brockeastman.com/uploads/1/3/1/3/131381976/dutizomesajun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/1048/2588/files/gadonejevo.pdf
    • https://cdn.shopify.com/s/files/1/0431/8212/9320/files/mechanical_drawing_symbols_chart.pdf
    • https://cdn.shopify.com/s/files/1/0429/0864/7580/files/mejapezupirixajofimu.pdf
    • https://cdn.shopify.com/s/files/1/0433/3328/8088/files/tanavetifavixuwavor.pdf
    • https://cdn.shopify.com/s/files/1/0431/8999/3636/files/torn_ukulele_chords.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5029/files/vipopiwadofa.pdf
    • https://cdn.shopify.com/s/files/1/0439/8333/9678/files/aptitude_questions_and_answers_for_computer_science.pdf
    • https://cdn.shopify.com/s/files/1/0438/8644/4699/files/beps_action_plan_8.pdf
    • https://cdn.shopify.com/s/files/1/0430/7861/5189/files/vebakowibefos.pdf
    • https://cdn.shopify.com/s/files/1/0432/9596/5352/files/gestor_de_contraseas_android_2018.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_off0001e9a0.bin
78298c708d73d3a5da099274486ddae960e100300374bfaa57be7fc96aaf2d70		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E9A0 6212 bytes
font_01_sfnt_off0001fe8e.bin
d7c958fd2f202f032d9adfaf9088b8c39d829b68e462017b936504cb1b16aa1f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1FE8E 16688 bytes

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