Malicious PDF — malware analysis report

Static analysis result for SHA-256 78be80185b2f0faf…

MALICIOUS

PDF

62.7 KB Created: 2020-07-31 10:03:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 16087fcfa2db4db2945e4a26355690a1 SHA-1: e9b0153ae12cfa94d2be284a877b32d84767b519 SHA-256: 78be80185b2f0faf9dca33fdfe48c430bebaf007d4258f486ce0426b8fa2144b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous links disguised as book download resources, directing users to a redirector URL. This redirector is likely part of a phishing or malware distribution scheme, aiming to exploit users' interest in free educational materials. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests SEO manipulation for traffic generation.

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.ru/pify?keyword=electrical+engineering+books+pdf+free+download+sites In PDF document text
    • http://files.benmarshallwriter.com/uploads/1/3/2/3/132302892/6427534.pdfIn PDF document text
    • http://files.lengbeau.com/uploads/1/3/2/7/132740445/sojobeguxijizaluv.pdfIn PDF document text
    • http://files.tatendadalu.com/uploads/1/3/1/8/131856917/vozisobarudoratav.pdfIn PDF document text
    • http://files.beautyblissbylisa.com/uploads/1/3/1/4/131438869/pifupititojewe.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/1/0432/8154/7424/files/67816839980.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/fadanamimurusekebunom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/3854/5819/files/novusilefefadepivul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4757/4949/files/21939432098.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/7949/8917/files/86805348379.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3123/9588/files/tetumaxokuxoxox.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/3127/3365/files/27596942227.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4162/7029/files/92620628084.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/9860/9566/files/rubufipepewafafaki.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/8222/7617/files/62752620729.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/0499/2408/files/30233581654.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 1

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_off0000b715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB715 5364 bytes
SHA-256: a69e87e7181bd6c4f141ba8e3baea900390f3bd8f3590e398133aaeb6b91ecab
font_01_sfnt_off0000c960.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC960 10904 bytes
SHA-256: e179f0263c43a13b1ac028984de2b4d15315daaf8690d438be053d0b78174fe2

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