Malicious PDF — malware analysis report

Static analysis result for SHA-256 04306f3d80e970fc…

MALICIOUS

PDF

43.3 KB Created: 2020-08-10 19:07:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4bccd6049cbb43026b3dfe3fe6a7fe9 SHA-1: 3830ae7244adbfbf8284e3509c7f9571775bb99d SHA-256: 04306f3d80e970fcffb183da19099a0d29b01580c2c70558658e8c8162726c41
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to Shopify domains hosting other PDFs, suggesting a link farm or SEO manipulation tactic. One critical heuristic identified a link to known malicious redirector infrastructure, specifically 'ttraff.ru', which is presented as information about childhood cancer symptoms. The document body, though heavily obfuscated, contains the same malicious URL and other PDF links, indicating a coordinated effort to drive traffic to potentially harmful sites. The presence of a password archive lure heuristic suggests this PDF might be part of a multi-stage attack where the actual payload is hidden.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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=cancer+infantil+signos+y+sintomas+pdf
    • http://files.colegacysports.com/uploads/1/3/2/7/132710782/bukidaxig.pdf
    • http://rumiviv.understandingwhowewere.com/uploads/1/3/1/4/131453540/tilinafiwud-pivisaxemoji-jolujako.pdf
    • http://files.worthit.productions/uploads/1/3/1/3/131380279/muxawokozagix.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/79894841610.pdf
    • https://cdn.shopify.com/s/files/1/0431/1616/7328/files/3_letter_username_generator.pdf
    • https://cdn.shopify.com/s/files/1/0434/1792/7837/files/vowedokixin.pdf
    • https://cdn.shopify.com/s/files/1/0440/6883/1382/files/blow_moulding_design_guide.pdf
    • https://cdn.shopify.com/s/files/1/0441/0854/6200/files/endometrial_ablation_procedure.pdf
    • https://cdn.shopify.com/s/files/1/0430/5158/1591/files/xowisomeniruvamebejo.pdf
    • https://cdn.shopify.com/s/files/1/0432/7460/0598/files/41312795342.pdf
    • https://cdn.shopify.com/s/files/1/0437/7195/3301/files/52220016774.pdf
    • https://cdn.shopify.com/s/files/1/0429/0222/5059/files/nikorojukozuberikupegenop.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/attic_red_figure_vase_painters_beazley.pdf
    • https://cdn.shopify.com/s/files/1/0431/8468/5224/files/pomidedetutodijufisele.pdf
    • https://cdn.shopify.com/s/files/1/0433/4262/6984/files/dufepumix.pdf
    • https://cdn.shopify.com/s/files/1/0434/2831/5288/files/79826665722.pdf
    • https://cdn.shopify.com/s/files/1/0433/0160/1444/files/blu_ray_region_codes.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_off000067c1.bin
cf20b2b521c38943730708bcb042bb344b2638561ec3517d38e11cd284982b71		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67C1 5484 bytes
font_01_sfnt_off00007a51.bin
9d260af9360812e24c332a5e5a79dc9764ffa306d3ac9479e123a401dbe4b4e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A51 11180 bytes

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