Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f31baaa26fa1b1b…

MALICIOUS

PDF

36.7 KB Created: 2020-08-14 23:38:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 694261ecd358e48e8dfcbb8d2f3e25b1 SHA-1: 3908ae9e76a6b8994e117e203fdc6e33fa9eac90 SHA-256: 4f31baaa26fa1b1bce22b69550a3fbef8cacd932ae3e034b333e01adedda28d8
194 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, with one identified as a known malicious redirector. The heuristic firings indicate a PDF link farm, suggesting the primary purpose is to lure users to external, potentially malicious, sites. The document body itself is heavily obfuscated and contains a mix of text and URLs, reinforcing the link-based attack vector.

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=narasimha+audio+songs In PDF document text
    • http://files.ifoodtz.com/uploads/1/3/1/4/131453316/zilavine_negizejufuvi_viboxovem_gikapuwesu.pdfIn PDF document text
    • http://files.wfhsbigred.com/uploads/1/3/0/8/130814085/f90f7589ce77f.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/1/0437/9761/0657/files/20957755958.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/8457/7956/files/29982057602.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0916/9815/files/pdf_bestand_kleiner_maken_om_te_mailen.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9785/0017/files/gewabidetetosolalaj.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6617/1287/files/wisobelexuvipuperuxikase.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/6910/4540/files/jaguwuruvotuxoz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1567/5809/files/72454992789.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/8103/1064/files/befalepodujefikixipo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/7179/0494/files/43065075607.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 2

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_off00004611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4611 4860 bytes
SHA-256: 54ffc94cf8f10444f5344e8960b1d9e86a28ae5dfad2e0da4e6867b61ad0c7c1
font_01_sfnt_off0000565b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x565B 9864 bytes
SHA-256: c3fc1a6b553c199949c69cc822714a32e42a7614e042e8cdd3bfbb129f13d8f4
font_02_sfnt_off0000781c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x781C 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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