Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f91531f71617c7c…

MALICIOUS

PDF

42.4 KB Created: 2020-08-12 06:51:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cdcf89bd6c00973e8835da1a5e32a110 SHA-1: 0fafe443374a17817bdb2477cd292563b084443e SHA-256: 4f91531f71617c7cd8dc9d7e0943fa354cebcd0eda1efe10064b1604f1819661
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains numerous links, including one pointing to a known malicious redirector (ttraff.cc). The document body, though garbled, contains text related to a 'Bulova marine star owners manual', suggesting a lure to trick users into clicking malicious links. The PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirm the presence of malicious and link-farming activity, respectively. The ML classifier also strongly indicated maliciousness.

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.cc/wb?keyword=bulova%20marine%20star%20owners%20manual In PDF document text
    • http://files.seedsongfarm.org/uploads/1/3/0/8/130873872/8804007.pdfIn PDF document text
    • http://files.iamkaybell.com/uploads/1/3/1/1/131163782/1596186.pdfIn PDF document text
    • http://files.energyharmonybalance.com/uploads/1/3/1/4/131483097/nokamow.pdfIn PDF document text
    • http://files.womeninbusinessisu.com/uploads/1/3/0/7/130775668/mivavo.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/87074842841.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/lotopad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1615/9385/files/mirumugu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4638/7362/files/71769481167.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7864/7957/files/ielts_writing_answer_sheet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/7232/9630/files/21073847293.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/8671/5805/files/69415601056.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/8980/5980/files/luzopatakuzure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2490/0515/files/59324000372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6989/8914/files/marsylianka_wielkopolska_nuty.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1372/6631/files/ridolutepu.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 4

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_off000067f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F5 5032 bytes
SHA-256: b11b0f340abd104397bc226516718c103bb078b8cc063d083d80a8652f2eaddf
font_01_sfnt_off0000790e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x790E 10940 bytes
SHA-256: fb8a9928463c2d594103674c53056e723726b3b57abc72104f4f9b02ff6e6bc1

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