Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4a6e18e2e28391…

MALICIOUS

PDF

50.9 KB Created: 2020-08-08 16:40:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 6f623eb2da09e3116927818a1da5001a SHA-1: ceb302b3d0e8f5729d567e6380ea6d9bfd07e952 SHA-256: 5c4a6e18e2e2839148edbc0da3b6627ae35001cc7fbac65b342dc869edca2f1d
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, many of which point to a redirector service known to host malicious content. The document body, though heavily obfuscated, contains a URL that is also flagged as a malicious redirector. The ML classifier strongly indicates maliciousness, and the presence of a link farm suggests an attempt to manipulate search engine results for malicious purposes.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • 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=oceanography+an+invitation+to+marine+science+pdf+free In PDF document text
    • http://files.bingludu.com/uploads/1/3/0/7/130740249/korabediduk-gowux-januvid.pdfIn PDF document text
    • http://files.squareonegoodsco.com/uploads/1/3/2/6/132695575/melasevojudemakijel.pdfIn PDF document text
    • http://files.maarer.com/uploads/1/3/1/3/131381614/16ad56719.pdfIn PDF document text
    • http://loweb.elleebphotography.com/uploads/1/3/0/7/130738615/lowusog-ruvijerineb.pdfIn PDF document text
    • http://files.trinityhouseentertainmentinc.com/uploads/1/3/1/6/131606550/8581045.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/1/0430/6354/1917/files/startup_restaurant_business_plan_sample.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1044/0862/files/subordinating_conjunctions_exercises_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9478/5694/files/48305210677.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/1437/9930/files/uae_new_arbitration_law.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5276/9192/files/vefonomuvejup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6274/7548/files/rexoletasezoloxilugex.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1540/3677/files/togaza.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5344/0414/files/best_book_to_learn_french.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3900/6615/files/xiwokogikaruvuro.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/94323725826.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7257/7946/files/xujifuxowarisixiku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7289/6672/files/lejegalog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0663/1833/files/early_literacy_skills.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4903/3640/files/22878615435.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000791e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x791E 5516 bytes
SHA-256: 5d2f3ce19c123b8518a69843d62fd8f1a5aa1065ed74702fa267c5960a908be2
font_01_sfnt_off00008bb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BB1 10464 bytes
SHA-256: 6a65905cc9f4cfd48eddfa4e44f732c5dc78a0a9220d6b7828af94742d8b3f69
font_02_sfnt_off0000af7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF7F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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