Malicious PDF — malware analysis report

Static analysis result for SHA-256 4398c1544e39dc1a…

MALICIOUS

PDF

40.5 KB Created: 2020-08-14 03:54:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a24e9c481cdfbebcc009673c22e8a561 SHA-1: b3afae30ad73527dc2dd16ae06d242fd4faaf9e8 SHA-256: 4398c1544e39dc1a3b2f7e1b8d45c0cbc0da781af41f49908cc85bd718f0ea11
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on Shopify, likely for SEO poisoning. One critical heuristic identified a malicious redirector link pointing to 'ttraff.com', disguised as an academic worksheet answer key. This suggests the primary goal is to redirect users to malicious infrastructure. No scripts were extracted from this sample.

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.com/pify?keyword=independent+events+worksheet+1+answer+key In PDF document text
    • http://bamigo.retrieversofmillbach.com/uploads/1/3/0/8/130813784/4359ec671.pdfIn PDF document text
    • http://files.madeintombstone.com/uploads/1/3/1/1/131163969/fuzefibegepago-goxos-ranal-rugimexade.pdfIn PDF document text
    • http://files.straystreetstnr.com/uploads/1/3/2/3/132302970/doribukoz.pdfIn PDF document text
    • http://files.larrondolab.com/uploads/1/3/0/7/130740618/reviri_xemabeji.pdfIn PDF document text
    • http://files.tworiversrecovery.com/uploads/1/3/2/7/132740860/91cf8adff.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/1/0447/4103/4135/files/penicillin_biosynthesis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1896/0545/files/bosch_invented_for_life.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3319/8745/files/41956981321.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8848/5288/files/fire_emblem_the_binding_blade_rom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4849/2438/files/winowasarexumafu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3006/8898/files/tamavelab.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/76640573288.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2084/5210/files/kamagifis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5698/8317/files/65542377753.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5928/1061/files/tijuvoj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0269/9681/files/54358667389.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6150/1336/files/wugitulimagupetajufure.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 8

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_off00005d8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D8B 5320 bytes
SHA-256: 4e7f940b1bef67a7c4226d78f58aff87c6c991c828717943978f6bb01e731daf
font_01_sfnt_off00006fb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FB8 11340 bytes
SHA-256: 523e99676d5420dd9ae15fac5370a514f6230bc6103f1ce3587954826aceb9a0

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