Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9bc824e1dcacca4…

MALICIOUS

PDF

36.7 KB Created: 2020-08-22 08:09:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 85375d5193290db1c48528afdfcabaf4 SHA-1: a7f5ed5ceafdabeedfaa5eacc6171c90380b993b SHA-256: a9bc824e1dcacca46f6b18e6262f5b851e046daed24b1c7fa175111ce67bbcce
194 Risk Score

Malware Insights

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

The PDF contains numerous links, with one specifically pointing to a known malicious redirector at 'ttraff.ru'. This redirector is likely used to obscure the final malicious destination. The document body, though heavily obfuscated, contains the same URL, suggesting a deliberate attempt to drive traffic to malicious infrastructure under the guise of providing a PDF on personality exercises.

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=describing+people%2527+s+personalities+exercises+pdf In PDF document text
    • http://files.paddlerivergolf.com/uploads/1/3/1/1/131164009/e0b74ad145b6cef.pdfIn PDF document text
    • http://files.breconcarsales.co.uk/uploads/1/3/2/3/132303189/bizod-wisibosukujaz-nozexisub-nelotiro.pdfIn PDF document text
    • http://files.vegasvowsforfree.com/uploads/1/3/1/3/131384432/770c15.pdfIn PDF document text
    • http://files.dhsdrama.com/uploads/1/3/0/7/130775413/xawikutonozifa-nosinixuvexetu-befulewubem.pdfIn PDF document text
    • http://files.costaparadiso.holiday/uploads/1/3/1/3/131379343/nukisujune.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/1/0444/3871/6583/files/perfiles_de_aluminio_catalogo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/suton.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/6028/2023/files/cars_3_movie_free_in_tamilrockers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/0636/7656/files/lutujome.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/6245/1611/files/curriculum_vitae_formato.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/1267/0111/files/76802595481.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0577/1927/files/lalopilitubebotib.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8244/9045/files/retirement_meaning.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/90840236881.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 8

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_off000051df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51DF 5564 bytes
SHA-256: 3a95a44729a8f6ff9c754ed3266e266d307d1507c31ef5ffae666cccf1012850
font_01_sfnt_off000064d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64D7 9684 bytes
SHA-256: c6dfe5c67f2792a9c0e9238559fd82d8b3fd35c1fa647724435b283e8d1feeb4

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