Malicious PDF — malware analysis report

Static analysis result for SHA-256 af74e0ef06ad05dd…

MALICIOUS

PDF

47.2 KB Created: 2020-08-13 04:41:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 326104cd26a716cedf208d6454b75803 SHA-1: 0de8b63a6d6c23737dbc8bb97bd6ab6e181ff107 SHA-256: af74e0ef06ad05dd1d3d4107046f6fe58adbba31e4b48c16df164d37b553d1f2
194 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by a machine learning classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at https://ttraff.ru/wb?keyword=cuda%20c%20programming%20guide.pdf. Another heuristic indicated a PDF link farm, suggesting a coordinated effort to distribute malicious links. The document body contains a mix of what appears to be document titles and embedded URLs, further supporting 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/wb?keyword=cuda%20c%20programming%20guide.pdf In PDF document text
    • http://files.adamramey.com/uploads/1/3/1/4/131437834/jajulemefobuxufefu.pdfIn PDF document text
    • http://files.amygerak.com/uploads/1/3/2/6/132681492/budis_xofiradobisiko.pdfIn PDF document text
    • http://files.handsofhopegallup.com/uploads/1/3/0/8/130873826/6359311.pdfIn PDF document text
    • http://files.senatorscycling.org/uploads/1/3/0/7/130739147/6015718.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/1/0431/4211/9592/files/apparatus_used_in_chemistry_laboratory.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4855/9004/files/finadezokodazux.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3277/1734/files/medical_genetics_book_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/0815/4008/files/moburobilisam.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/26384136461.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9767/0303/files/nanomaterials_lecture_notes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/bisadugizutojaririxenudep.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3015/0309/files/95438929377.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/9124/4696/files/15664246062.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1898/5372/files/nimowukad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7841/0655/files/69314868044.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_off00007432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7432 5204 bytes
SHA-256: 595c35d7672e0b4ede0615243834cbebf85f0b6c8a84324b0b81078c952f8a44
font_01_sfnt_off000085d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D5 13228 bytes
SHA-256: f8b255a7ab8e53e5cb601f6d83d0f179e57403bb60d455ac97ec08e54ba6d52c

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