Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbc98688473e3fe9…

MALICIOUS

PDF

39.9 KB Created: 2020-08-12 20:55:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ffdc8fb2b5f73fa87542d55ce714a75d SHA-1: cd4e4df9a8b33e0f99527b705fa7be09fce76b5c SHA-256: fbc98688473e3fe95419ee3c3217d9131fb56a15fc50a6f32378bc587643be34
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which points to `https://ttraff.cc/wb?keyword=roman%20numbers%20worksheet%20for%20grade%204`. This URL is presented within the document body, disguised as educational content. The presence of a large number of external links, many hosted on Shopify, suggests a link farm or SEO poisoning tactic to distribute malicious content. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive document.

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=roman%20numbers%20worksheet%20for%20grade%204 In PDF document text
    • http://files.karenfeiling.com/uploads/1/3/1/4/131437531/bejewifut-nowebumakemuxok-roxedirulatu-pubul.pdfIn PDF document text
    • http://files.factorytourists.com/uploads/1/3/1/4/131483361/dedefefakimedogu.pdfIn PDF document text
    • http://files.greatwhytesurfboards.com/uploads/1/3/2/8/132815002/zaxanidefadop-jemivibuxira-suzuzativu-pirem.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/1/0432/2010/7428/files/sudevogutobo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4107/1016/files/40048504628.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/1560/2339/files/87678230507.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5025/5014/files/71587909091.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/9568/5288/files/witches_cauldron_witchery.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/isospora_felis.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/7802/5377/files/12732384590.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2806/7990/files/system_analysis_tools.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6321/3209/files/90478580702.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0549/2904/files/97597648409.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5071/9642/files/fasezup.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6706/4998/files/zadagokawabexufufebeli.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 5

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_off00005d3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D3F 5680 bytes
SHA-256: b7619f24d352fc05cdcae8d97ef0e576b3785c573568a8e4bec888b13828ce40
font_01_sfnt_off0000707d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x707D 10024 bytes
SHA-256: a8fe1808357e63bc2476dfec6386b041a1761bd2150a306d41230d608f156ba3

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