Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51e3d1eb5c430e7…

MALICIOUS

PDF

41.4 KB Created: 2020-08-01 04:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: d5194c7187b0afd157930235f593b19f SHA-1: fb4a385fff3ba0c8530ed039448d13356194225d SHA-256: b51e3d1eb5c430e72a5f63d8386c30b3227122ad3f5bc2b8dc88dd646b184821
194 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, many of which point to a link farm hosted on Shopify. One critical heuristic identified a direct link to a known malicious redirector, ttraff.com, which is used to obscure the final destination. The document body text, though garbled, contains keywords related to a 'Bentley repair manual' and the malicious URL, suggesting a lure to trick users into clicking the link. The ML classifier strongly supports the malicious nature of this PDF.

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=bentley+repair+manual In PDF document text
    • http://files.uogcbssc.ca/uploads/1/3/0/8/130874324/wugidijiposa-givasamom.pdfIn PDF document text
    • http://files.blackwatervideo.com/uploads/1/3/1/3/131379525/wokemukinenur-xunep-juxivulawud-vituzegeput.pdfIn PDF document text
    • http://files.michelsphotos.com/uploads/1/3/0/9/130969819/6647722.pdfIn PDF document text
    • http://files.bcrowleylaw.com/uploads/1/3/1/8/131871705/misab_rizapow.pdfIn PDF document text
    • http://files.vocationaleducationwaiahole.com/uploads/1/3/1/4/131410479/9581018.pdfIn PDF document text
    • https://github.comIn PDF document text
    • https://github.com&#39In 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/1/0430/6924/3553/files/7804400871.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9071/5548/files/jujumazivexenunizisuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/91146339154.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2328/5920/files/sexerenogarezutig.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5265/5002/files/gefegixosuvufipesajulo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5727/4270/files/texulu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6962/6781/files/vemurebosizafuguw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3778/6266/files/pijegepezinusuzapi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7238/8249/files/69069130088.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5359/6322/files/zixan.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_off00006098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6098 4940 bytes
SHA-256: bee739ea5066d2caae99a0c9057676d34864d5a5867276d2a1b0487d56416323
font_01_sfnt_off00007157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7157 12036 bytes
SHA-256: 9b1f1d6f553a45cefa8b53a72a03838cf741e796cb2e013631b6bdeee8de23bb

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