Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3c8ed809a4cefe…

MALICIOUS

PDF

42.3 KB Created: 2020-08-11 06:24:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 40ab97fe0e988f86689e7dba2440683c SHA-1: 64e6ca40c959939ee968cdfd73479562472bddac SHA-256: 4a3c8ed809a4cefe80a178705cd42e4e265e761e4851fdb7c41f5b96f5824409
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a link farm and a direct link to a known malicious redirector, ttraff.ru, disguised as a link to an English exam preparation book. This indicates a phishing or scam attempt. The document body, though heavily obfuscated, contains the target URL and references to PDF files, reinforcing the lure. No scripts were extracted, limiting the analysis of further payload delivery.

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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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=cambridge+english+advanced+cae+book+pdf In PDF document text
    • http://files.thedecorsite.com/uploads/1/3/2/6/132683137/fepupulobofeba-gibaliposevo-jilezozexir-zigeduta.pdfIn PDF document text
    • http://files.manifestedvisionsnlr.com/uploads/1/3/0/7/130738871/talufixiwexusukelej.pdfIn PDF document text
    • http://files.yogaterrium.com/uploads/1/3/0/7/130775143/9182553.pdfIn PDF document text
    • http://files.3dpd.co.za/uploads/1/3/0/7/130776277/2687497.pdfIn PDF document text
    • http://files.collingwoodresearch.com/uploads/1/3/0/7/130739475/bukike-kilagoviz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bafewemuwidizisaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7657/4620/files/classic_hunter_bis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5965/9420/files/migapuw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2613/6731/files/jupazorawawulisep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/4572/5094/files/kakozibovazonomubepez.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6967/6451/files/avr_asm_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3533/6616/files/gumibaxurexaler.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/4260/9051/files/afinidad_quimica.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1922/9591/files/ct_dmv_license_status.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4420/8797/files/47361705497.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9177/8965/files/suposaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7991/5934/files/xosidiwuxiwelowof.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0133/1364/files/thaumcraft_1._7._10_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fovurasavelibegesixaga.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005a08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5A08 5564 bytes
SHA-256: a683adfdd2c41bc3edf4e69761b4e28c4b253bc22a5de704196c23ae9c14c593
font_01_sfnt_off00006cc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CC0 9688 bytes
SHA-256: 0f234f1a7140f9f9a1173ee7a64aa3d89b778b0c692dda41358f6acb1a87cb47
font_02_sfnt_off00008dd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DD6 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378