Malicious PDF — malware analysis report

Static analysis result for SHA-256 81e3e9cc704d12c5…

MALICIOUS

PDF

38.0 KB Created: 2020-07-30 18:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7117892006e1e0c434b7012a8cefad5d SHA-1: 5f02e39758025ee6e0ae138a7e671918e0a7feed SHA-256: 81e3e9cc704d12c522570c3a8c4056610303f31e8e55d84c0872f87a1c0aa9ab
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically identified as a link farm and a malicious redirector. The primary redirector URL is `https://ttraff.cc/pify?keyword=biochemistry+vasudevan+pdf`, which is designed to lure users with a fake download. The ML classifier strongly indicates maliciousness, and the presence of numerous external links points to a phishing or scam attempt.

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/pify?keyword=biochemistry+vasudevan+pdf In PDF document text
    • http://files.fredhansenre.com/uploads/1/3/0/7/130738806/f996dc94b2.pdfIn PDF document text
    • http://files.saltwaterandseaglass.com/uploads/1/3/0/7/130775084/rumorur-giduzerumerot-lurapazo.pdfIn PDF document text
    • http://files.aohbucks5.com/uploads/1/3/0/9/130970004/buketurudiro.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/1/0431/8851/9074/files/33037647903.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3225/5392/files/katuwufosedoxokinim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/3208/2594/files/kokujebapoturupe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0141/1744/files/84631652168.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2965/0843/files/73508535400.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/92715782061.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2206/5557/files/rewurenemiz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2947/1130/files/15008997875.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8705/9362/files/najusagevugikexugefe.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8935/3118/files/tifaxifaliwemutin.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/3928/4645/files/50916148669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2644/7525/files/94214361673.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5167/9893/files/xunoguxonabapara.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 2

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_off00005714.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5714 5456 bytes
SHA-256: 89664be7ebe82bf0db2be911ff37eba0ab57392f2aba2227b23d853e98c5f4b8
font_01_sfnt_off00006981.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6981 9828 bytes
SHA-256: e4e2d76fc1079ee71d36a1a1314c39af36dabf141c43f2a2f48c0d8a5e164f16

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