Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bba3fab1a5ada78…

MALICIOUS

PDF

33.9 KB Created: 2020-08-24 07:44:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 37ccc878ba2754a97e6d048096b56d47 SHA-1: a7efb5844ec26fad5eeffd288f1713de627cea1f SHA-256: 8bba3fab1a5ada78652a1f598f3fa62890d50d38ccfff4633c8c39f78532fc61
194 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one pointing to a known malicious redirector infrastructure at `ttraff.ru`. The document body, though partially corrupted, suggests an attempt to disguise these links as educational material. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm further supports a malicious intent to redirect users to potentially harmful sites.

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=honors+biology+dihybrid+cross+worksheet In PDF document text
    • http://files.armandozumaya.com/uploads/1/3/1/4/131454389/vajebujumijipufuxo.pdfIn PDF document text
    • http://files.wordsplusthoughts.com/uploads/1/3/1/1/131164351/liwovemovagonam_xafon_gabenanadigulu_xupakigefasofib.pdfIn PDF document text
    • http://files.katherinemarieprice.com/uploads/1/3/2/6/132681558/5372184.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/1/0431/8763/4338/files/63049174939.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/refitapobofubogiwimubik.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/5886/9910/files/callan_method_english_books.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2825/0781/files/4343624372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/denofawumajezoxowevilalo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/8260/2904/files/desaz.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3137/9624/files/95782393860.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2262/8502/files/arduino_duemilanove_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4211/1641/files/fetadajefatizafomad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0580/4698/files/watch_riverdale_season_2_episode_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/47184882359.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_off000047ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x47BA 5348 bytes
SHA-256: 153a420853463a400afbace7265b12763ee2187d8d6bcba43dbceade95fffc85
font_01_sfnt_off000059f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x59F2 9632 bytes
SHA-256: 328df645b27e929dca6fed82913f5c3c41f1287304cc5916117416fe9a7dc02b

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