Malicious PDF — malware analysis report

Static analysis result for SHA-256 31081b333ffe164b…

MALICIOUS

PDF

34.9 KB Created: 2020-08-15 05:02:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a75cc0698ac4b62ea110a630b52e2b50 SHA-1: 3787680de698f4f84bb34d1816a01ef7374ebfd1 SHA-256: 31081b333ffe164bf897074acb7551080239183816e1f68daed2b85ade598e4f
194 Risk Score

Malware Insights

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

The PDF contains a link to a redirector hosted on 'ttraff.com' which is flagged as malicious. The document body and heuristics indicate a lure related to 'hazardous materials operations test answers', likely intended to trick users into clicking the malicious link. The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute the malicious content.

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=hazardous+materials+operations+test+answers In PDF document text
    • http://files.entomoanthro.org/uploads/1/3/1/4/131483197/nizijeb_toririwinere_lunemepax.pdfIn PDF document text
    • http://files.cyclingadventures.net/uploads/1/3/2/6/132695689/sulexovabub_bubizelogu_mekodovi_pinuvawenun.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/1/0433/0687/7080/files/nezax.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3309/9430/files/wekemijetunos.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/0081/6028/files/free_dj_sound_effects.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8326/0314/files/5063157119.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/8472/4889/files/rezujadajaxoduw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/94766401197.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/7121/8588/files/a_k_jain_practical_physiology.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7754/1787/files/fudamijisodifizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1152/9114/files/79270672580.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5339/1780/files/waminobanixufelozabezerub.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8321/9619/files/4791507563.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_off00004b80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4B80 5208 bytes
SHA-256: 791d6f3ba55a4156b41e0de4bc14c96a7511a401fa7343793b58684223a14e94
font_01_sfnt_off00005d30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D30 9820 bytes
SHA-256: a286fb90ad31c9b687b23e66c36f79b33755fd087d4a8984f5634dd0068083bc

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