Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf3d45ebde51a819…

MALICIOUS

PDF

42.5 KB Created: 2020-08-12 16:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: efe598f772c49c833f0d69a4e0092935 SHA-1: bec71b1e71e32db893b5c5dcf70d403ff07bbc99 SHA-256: cf3d45ebde51a8191b91315735b2c43e419d2b43697ff678528bbbc55b1c47ff
194 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many pointing to benign content, but one critical link directs to a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the target URL, suggesting the PDF's primary purpose is to redirect users to malicious infrastructure.

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=distributive%20property%20worksheets%20grade%208 In PDF document text
    • http://files.allanpierce.com/uploads/1/3/0/7/130776104/343cba3fc.pdfIn PDF document text
    • http://files.mrober.com/uploads/1/3/0/7/130738554/3944755feaa.pdfIn PDF document text
    • http://gazaratab.locogringosstreettacos.com/uploads/1/3/0/8/130814297/vugimuw.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/1/0431/7220/0608/files/wulurifesumetavisageleli.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/2778/4095/files/ableton_live_9_suite_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/669297692.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2318/7616/files/35589275061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/lipid_bilayer_structure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0252/7895/files/definition_of_management_journal.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5900/4070/files/66322933355.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5541/5445/files/2502154359.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0756/5209/files/98524089349.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7036/5589/files/demakaf.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/6847/9898/files/trastorno_esquizofrenia_paranoide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0937/4368/files/contemporary_behavior_therapy_6th_edition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9881/6150/files/righteous_mind.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 6

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_off00005901.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5901 5616 bytes
SHA-256: d2e496c7461a9f5cbdbf665e6dcd474321c9f3001fbd519144dca95048dc6f81
font_01_sfnt_off00006c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6C43 10152 bytes
SHA-256: 7b2dc11b45179131b07aaa267eb93337ab3876cffb8805f8c38e454c953ef2f6
font_02_sfnt_off00008ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EF7 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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