Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb7809bb6d452b6a…

MALICIOUS

PDF

55.8 KB Created: 2020-08-14 16:16:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c7fea3ed273e60d215c25c0469c5e31b SHA-1: 380a9265a41cd6d99dd3eae3a5ac0f45bf162cc3 SHA-256: cb7809bb6d452b6a34be64c7e516645f24527d39eb9008eaf65590374fc0ca28
202 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple embedded links, including one that redirects to a known malicious infrastructure at `ttraff.ru`. The document's content and heuristics suggest it is part of an SEO link farm designed to lure users with seemingly legitimate document titles, ultimately leading them to malicious sites. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=ophthalmology+journal+author+information In PDF document text
    • http://moxefiz.daigribbleangling.com/uploads/1/3/1/4/131413718/77c8c9fc18ebe4a.pdfIn PDF document text
    • http://files.thoughtsfromthepaint.com/uploads/1/3/2/6/132682076/8225074.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/1/0438/2100/7005/files/jurnal_atavisme.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/9800/3874/files/rezagaxunizifil.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/1103/0690/files/14521764683.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/8734/0454/files/bach_christmas_oratorio.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/5943/0054/files/sindh_textbook_board_jamshoro_english_book_9th_class_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9465/4632/files/wolifomomudawaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85450973079.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009d21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D21 5344 bytes
SHA-256: 3a78a1c59f6c55806bc6b3a153ea8d512dbbd36a21ceba424c02ccf56e5d0118
font_01_sfnt_off0000af3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF3C 10376 bytes
SHA-256: 52d6801e52faad1b76e17938cfdc27a3147a69297458db355e3d879ca7fdb4ab