Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1aaf8f5812b948…

MALICIOUS

PDF

57.4 KB Created: 2020-08-06 10:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c9da836511c2ebb51b079d75c182b37f SHA-1: 435f237fa867da4f88005bf59c306046c531ad41 SHA-256: 4b1aaf8f5812b94877fbcc211fa59a6b656e99bbeb6cb211d09e87e9f3a30af5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by a machine learning classifier as malicious and contains numerous embedded links. One of these links directs to a known malicious redirector, traff.cc, which is likely used to obscure the final destination of the attack. The presence of a large link farm suggests an attempt to broaden the attack surface or engage in SEO poisoning to lure victims.

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.cc/pify?keyword=riesgos+infecto+biologicos+en+el+trabajo+pdf In PDF document text
    • http://files.k-mitchell.com/uploads/1/3/1/0/131071137/sirumekexom_tilitinevesuxe_wagivaso.pdfIn PDF document text
    • http://files.soroptimistofwoodland.org/uploads/1/3/0/8/130874154/7192341.pdfIn PDF document text
    • http://files.martinspitznagel.com/uploads/1/3/1/4/131452958/715791ba6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/9884/7896/files/michael_myers_theme_song_piano.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/53219786998.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9227/9445/files/juwulegesuva.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/6263/1326/files/jisawipasifibigusol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/1647/8110/files/tuxozaginutivurokag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2014/7112/files/9906887225.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3845/7501/files/logulumuwumaner.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9110/7742/files/guida_turistica_della_calabria.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6142/5814/files/lutefewojapemoduketejogef.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6137/1290/files/8990981286.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9870/9918/files/wurufazofebu.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

Related samples 6

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a080.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA080 5544 bytes
SHA-256: d453cb454e6ba1587bfbe3c5f2d716467823001fc9a3d0d2128ceaa55a498fba
font_01_sfnt_off0000b375.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB375 10820 bytes
SHA-256: 7e0594bc3a86b94462984feff88077f1f18b7c8095795acdbea4101b85f337c6

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