Malicious PDF — malware analysis report

Static analysis result for SHA-256 37fa0b6c15c4591d…

MALICIOUS

PDF

45.5 KB Created: 2020-08-07 13:51:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 50d498644831de4df3c4d217b5b7a9f4 SHA-1: 8898469f98c7cc4e6a0ad00aed6ef624e2c5027e SHA-256: 37fa0b6c15c4591d9efc91003a6ca37953b75cc667bda16182eb1ea011e4af1e
194 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The document body, though heavily obfuscated, contains text related to 'magazine article structure pdf' and the wkhtmltopdf tool, suggesting a lure. The primary malicious IOC is the redirector URL, which is likely used to funnel victims to further malicious content. The presence of a link farm heuristic indicates an attempt to manipulate search engine results.

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.ru/pify?keyword=magazine+article+structure+pdf In PDF document text
    • http://files.irishsetter.is/uploads/1/3/0/7/130739059/5001898.pdfIn PDF document text
    • http://leroroje.shopgroveonline.com/uploads/1/3/0/9/130969176/5488751.pdfIn PDF document text
    • http://bitiv.moveablefeats.com/uploads/1/3/1/6/131637419/vivenemetem.pdfIn PDF document text
    • http://files.newportpoetry.com/uploads/1/3/1/4/131453950/4765793.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/1/0428/9842/3967/files/95590756916.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1932/2022/files/vasog.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6345/1560/files/shoutout_command_twitch.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1993/5655/files/52680427229.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0447/1242/7674/files/calendario_laboral_2020_ccoo_madrid.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8951/7978/files/xuxepuwepebusalelek.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1995/9463/files/muscle_labeling_quiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2359/6693/files/numuxejopitedelem.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2629/8533/files/xumimorawuvejusi.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 2

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_off0000684c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x684C 5152 bytes
SHA-256: 400104a655e17a409026417df11d588986c6b5645466e9217a6479284e895f02
font_01_sfnt_off000079e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x79E5 9840 bytes
SHA-256: 5591bcfb4bd1a96d2188a681f4f1156708885352571ac2ab457ac9f911993f31
font_02_sfnt_off00009b76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B76 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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