Malicious PDF — malware analysis report

Static analysis result for SHA-256 b51d4cc6646939fc…

MALICIOUS

PDF

50.1 KB Created: 2020-08-05 09:30:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: afd7573783225ed0eba2a52abf8f23c5 SHA-1: 3eef4289d403b147e2031991cc2bf8ccc319f0b9 SHA-256: b51d4cc6646939fcf75e8bef4b6748d1e96877a0b7c3718c6cb3fd635f53fa1b
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, many of which point to a link farm hosted on cdn.shopify.com, a common technique for SEO poisoning. One critical heuristic identified a link to a known malicious redirector at 'https://ttraff.com/pify?keyword=factorising+quadratic+equations+worksheet+pdf'. This suggests the document is designed to trick users into clicking through to malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure and link farm indicate a social engineering attack.

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=factorising+quadratic+equations+worksheet+pdf In PDF document text
    • http://fodof.jenniferphamportfolio.com/uploads/1/3/0/8/130874276/e9d1aba49.pdfIn PDF document text
    • http://lelun.congletondogtraining.co.uk/uploads/1/3/0/8/130814769/virimuzebusejuw.pdfIn PDF document text
    • http://files.gingerfitspo.com/uploads/1/3/1/8/131858287/wujelep-rijiw.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/1/0429/4891/9450/files/54126129304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1391/5303/files/xebomokuribedob.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0212/5733/files/70684526054.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3437/7372/files/lesson_plan_in_english_literature.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7437/1235/files/between_shades_of_gray_espaol.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2992/0930/files/affiliate_marketing_definition.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1101/2770/files/nadovopuwidoviwupetosara.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4439/7468/files/19101040521.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3061/8020/files/44598594190.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6744/0290/files/voxasuvege.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0450/6664/9750/files/minecraft_crash_log.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/8922/9979/files/31747341536.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 3

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_off00007def.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7DEF 5624 bytes
SHA-256: cc5559f63ef6ec02852b756d155294c5e672ea15cee322168616f96046bff0bc
font_01_sfnt_off00009118.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9118 13504 bytes
SHA-256: 3fd9859cd85425cb31099efeca3072eb782769e21dfd84774a2702af1427e623

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