Malicious PDF — malware analysis report

Static analysis result for SHA-256 609d36872d2ed4d1…

MALICIOUS

PDF

45.9 KB Created: 2020-08-31 02:29:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 640d6e7142c81d89e497bcd76b7640b2 SHA-1: 942bfae5329207b01ad0d92dc6f921cd67c180a0 SHA-256: 609d36872d2ed4d19a0482c32f1c739a1de4873dbb6741092f096235fb8be8d4
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple embedded links, with a critical heuristic identifying a malicious redirector. The primary redirector URL, 'https://ttraff.cc/wix?keyword=motor+compuesto+diferencial', is flagged as malicious. The document body, though heavily obfuscated, contains references to this URL and other PDF links, suggesting a link farm or phishing lure. The ML classifier strongly supports the malicious verdict.

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/wix?keyword=motor+compuesto+diferencial In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static.usrfiles.com/ugd/a6e5e9_527399c0639446bca8b007f91356eb14.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/ae15ca_58731af51bf746d8a3049cca86759841.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b8c837_317bc0550ebd4c2b950a42dea582c972.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/286fb8_d0b8b8126f7e415596bbfcc976defd2d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/defdb4_115bf67fe32346cab86202310683d2a7.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/8e1900_3361d78566aa44de8eb31ef192396bf1.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/63d3ad_8c50a82c4cec422db57aefc829861e62.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5535/7852/files/vepum.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/4946/8582/files/71757234096.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/5109/0077/files/86145180549.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/0160/9366/files/33437225062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4529/8074/files/sizetizi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6463/1195/files/fatoxowatukaguduwexoxekag.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9878/3382/files/74913980090.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Related samples 8

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_off00005caf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CAF 5304 bytes
SHA-256: 5ccc32da7950bbc00a56385a58334f583123b5e8aed43c6ae69d4ab9dbfbf2e2
font_01_sfnt_off00006eaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAA 11432 bytes
SHA-256: 1a3138347c2487fb11b8094710fb70e7d8c4367eedf42ede789bead22e950332
font_02_sfnt_off000093fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93FE 16192 bytes
SHA-256: 2fbb528c30fae61c70ff4082faa5fece981988df10abad1a91cab371b780b9de

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