Malicious PDF — malware analysis report

Static analysis result for SHA-256 f31d4da6a0426231…

MALICIOUS

PDF

39.8 KB Created: 2020-08-06 10:32:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 5af025e9dfe602c2ca796d6a69ee9266 SHA-1: 3b537fb00572e77801b8cfc4eed0d4dcebd70217 SHA-256: f31d4da6a04262319d4b99d52ebb2a95458a213ab5cbb554472d206b4f83fd1b
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/pify?keyword=vapour+absorption+refrigeration+system+pdf+nptel'. This URL is likely used to redirect users to a malicious site. The document body contains garbled text but also repeats the search query, suggesting a lure. The presence of numerous external PDF links, many hosted on Shopify, indicates a link farm strategy, likely to improve SEO for malicious content.

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=vapour+absorption+refrigeration+system+pdf+nptel In PDF document text
    • http://files.sagehairstudioreno.com/uploads/1/3/0/7/130775196/jiseseguviji-ralanos-gedumewekozepaw-fadodorati.pdfIn PDF document text
    • http://files.amagier.com/uploads/1/3/2/6/132696067/93fe0.pdfIn PDF document text
    • http://files.abdullah-francis.com/uploads/1/3/0/8/130813796/raradofeva_kovibukukifid_gagomen_zomifun.pdfIn PDF document text
    • http://files.froufrouproductions.com/uploads/1/3/2/6/132683142/4795448.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/1/0443/4988/2524/files/diagnostic_microbiology_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/3205/1873/files/jepisejugetotidak.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4046/3255/files/18152794795.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0441/2401/2696/files/anatomie_et_physiologie_du_coeur.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/4043/9446/files/96964644686.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/1402/8444/files/58022868097.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5570/2425/files/nasazofajepi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5419/3047/files/biwuvakurivi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7836/0987/files/levij.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/9376/2975/files/62941584871.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 6

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_off00005d15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D15 5568 bytes
SHA-256: f915a77ad37c29c609af79a868942a1d295bbabe715abb104b25636fc7998d03
font_01_sfnt_off00006ff1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF1 10068 bytes
SHA-256: 67227990c1df7d3c3f29be3982c3f332168727d45623605351444859f37be068

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