Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c58a376e8e8b771…

MALICIOUS

PDF

38.7 KB Created: 2020-09-11 06:26:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 7f07a9d16721d1c9a771e3c8c2087207 SHA-1: c9d3a8748719507b0cf690cc3afebd866a717cb6 SHA-256: 6c58a376e8e8b771801dbbcaadc719de20143ceec8de652997ea15619988d44d
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, many of which point to a redirector service and then to a large number of other PDF files. This behavior is indicative of a link farm or phishing campaign designed to obscure the ultimate destination or distribute malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.link/wix?keyword=mainsheet+swivel+cleat In PDF document text
    • http://toxipo.legacycaengineering.com/uploads/1/3/0/9/130969690/f2a1bd.pdfIn PDF document text
    • http://files.senoritacinema.com/uploads/1/3/1/3/131398251/nubogiriwe-timejixixug-sofodexafabogu-nadidasoza.pdfIn PDF document text
    • http://files.taylormadebling.com/uploads/1/3/0/7/130776218/forutuvuzoxi.pdfIn PDF document text
    • http://files.natickpegasus.org/uploads/1/3/0/9/130969758/zotupideg-kokekarejoxib.pdfIn PDF document text
    • http://rexorot.jordanback.net/uploads/1/3/1/6/131606349/niduzekuvu.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://static.usrfiles.com/ugd/6dcf04_5df31c78feb24b9fa77f83e234a7209d.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/544c7e_92ff938e394c488b88618d43ede472fa.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/f09a9d_b4969d7e24964a1084f1543ccec164be.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5bb01c_577586226a674e4c8890065dc9c1288c.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/5438e3_d767bedaa6bc47c799270beaae131690.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/0c41e7_f3d80a7b8708423cb3da5c05242b58b4.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/173616_7ada20d81f5f4798aa830180597a317f.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/affb4a_64b73ac20bf7474e90b4ec80a0a6cdc5.pdfIn PDF document text
    • https://static.usrfiles.com/ugd/b96e41_a1742ee5cef1433aaee75390b538f6f4.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/6693/0840/files/7604197043.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5727/3237/files/35380337336.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6081/3208/files/install_yarn_on_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2965/9797/files/98663164449.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9676/0730/files/gegemi.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x49BE 4628 bytes
SHA-256: d0942f2ca0654768458085895da2ea2af9bc9df9a617ef208c28cdbe130833ac
font_01_sfnt_off0000597e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x597E 12060 bytes
SHA-256: c1a6e5e7952cd5decda0602724642961f7e00c86441c2190fb191ced4626dd4b
font_02_sfnt_off00007fb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7FB1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3