Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca116ad7d0b9e993…

MALICIOUS

PDF

43.2 KB Created: 2020-08-03 13:25:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: cf04fb90980fc17bb6b22c1a30d8e13a SHA-1: d181b90c491a458f3ec25d096a1281b330aba6dd SHA-256: ca116ad7d0b9e993882f7b984c4d4b825bcbb56c22f63cb7f4ac6d75b43f2d8d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains numerous links designed to appear as free downloads for popular books, such as "Understanding the Linux Kernel 5th Edition". The primary link, https://ttraff.ru/pify?keyword=understanding+the+linux+kernel+5th+edition+pdf+free+download, is identified as a malicious redirector. The document's structure and embedded links suggest a phishing or scam attempt to redirect users to potentially malicious sites or to download further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

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=understanding+the+linux+kernel+5th+edition+pdf+free+download In PDF document text
    • http://files.llenise.com/uploads/1/3/0/7/130775309/vogiji.pdfIn PDF document text
    • http://files.grinlaw.com/uploads/1/3/0/7/130775342/2208056.pdfIn PDF document text
    • http://files.artisanresidentialdesign.com/uploads/1/3/2/3/132303068/1868334.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/1/0429/4259/5239/files/74096840589.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/4576/3744/files/98760259090.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5417/8216/files/74491340717.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0349/5071/files/befixomuwaxoputade.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9494/0573/files/71568555654.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/dofupuz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2985/5393/files/xudijolojotexo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/4590/3774/files/89632043686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/4494/5571/files/algebra_michael_artin_2nd_edition_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9769/9992/files/nujavejupiximasofizepos.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C80 5524 bytes
SHA-256: e470bc6bc565294014832fbb232ac24e8fa831e1b380c93b3ae8e3cc91dc3b6d
font_01_sfnt_off00006f56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6F56 9996 bytes
SHA-256: 8fc477bb8961fe20f7171c3e2e4303d6d4e6428f004b147cb7508adac6ffaf28
font_02_sfnt_off0000917c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x917C 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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