Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bf8d1ce4b049a2…

MALICIOUS

PDF

35.5 KB Created: 2020-08-16 13:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 90f20f2d94b212bd70ab26faa92f7df1 SHA-1: 24fb41256f966291c06bf352a39d66640d5d9239 SHA-256: 91bf8d1ce4b049a22c8c57af0911c2369d245406169d1a3308032fdfd1b0bdc5
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF file exhibits characteristics of a link farm or SEO manipulation, with numerous embedded links to external PDF files. One of these links, 'https://ttraff.ru/pify?keyword=boozehound+informally+crossword', is identified as a known malicious redirector. The document body contains garbled text and embedded URLs, further supporting the malicious nature of the file. The primary attack pattern involves luring users to malicious infrastructure through a deceptive document.

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=boozehound+informally+crossword In PDF document text
    • http://xitasir.soireeseventsrentals.com/uploads/1/3/1/4/131408280/8b18584.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/1/0438/0780/1504/files/ancient_ayurvedic_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3873/5517/files/minecraft_fishing_enchantments.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/netelevoroseradofojif.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9656/4131/files/suwuke.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2401/3722/files/duforabagapulug.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8140/9436/files/autocad_electrical_tutorial.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/9846/4661/files/sinapusemukikibaninu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/2457/9736/files/nato_phonetic_alphabet.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kamunikizesow.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7103/5809/files/58621494931.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/0470/6464/files/xotivemusabevejuteru.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1239/9010/files/sezurub.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_off00004c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C6C 5556 bytes
SHA-256: 81f05a36d331dbadf9b26838c9d9a72d678ed7c80f76aa44f70ab480dc6b1376
font_01_sfnt_off00005f41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F41 9960 bytes
SHA-256: ba3281b9d2850919c5afb305988cbc4c7728a14e157375d2ad2cecaaf4c4643f

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