Malicious PDF — malware analysis report

Static analysis result for SHA-256 99e1f3418bf5ad50…

MALICIOUS

PDF

52.9 KB Created: 2020-08-04 22:14:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: b70dacf16a8b16d85afe2d6fca7f31de SHA-1: 296805b2a7abaf3484abf5a9af49d10601a715f9 SHA-256: 99e1f3418bf5ad50f1451e04c909716384a902bc5600bd4ce58f88562d7e9a36
194 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, disguised as a 'set theory questions and answers pdf'. This heuristic, combined with the ML classifier's high confidence, indicates a malicious intent to redirect the user to a harmful site. The document body, though heavily obfuscated, contains the same lure text and URLs, reinforcing the attack pattern. No scripts were extracted, but the PDF structure itself is used for the malicious redirection.

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=set+theory+questions+and+answers+pdf In PDF document text
    • http://files.vlavc.com/uploads/1/3/2/6/132682335/1210313.pdfIn PDF document text
    • http://files.panatlanticexchanges.org/uploads/1/3/1/4/131453206/fedar-jilimojon.pdfIn PDF document text
    • http://turer.holisticpanama.com/uploads/1/3/2/3/132302963/5618479.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/1/0437/3826/7809/files/66866123470.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8126/1466/files/how_to_open_usb_on_mac.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5602/9093/files/59234929851.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4431/4024/files/20315527057.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/4273/4237/files/2015_subaru_forester_manual.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/31903895201.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/9018/9219/files/5673609308.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/2821/8010/files/tuduzes.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/5076/1377/files/20000666059.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/3420/4568/files/94942902194.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2553/8973/files/defobezirepitelepufe.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn 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_off00006eea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6EEA 5520 bytes
SHA-256: 2d4a6408157f5e1d46a6f80b32a0344d31d010d1655a2480ba398b3cc17d6fea
font_01_sfnt_off000081c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81C0 13660 bytes
SHA-256: e9736030e54b17b1ffabe4b1182cbf5696305166e4b5fb0102aee770fa9ab37a
font_02_sfnt_off0000ad90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD90 17084 bytes
SHA-256: 94ea3249caaf5ebce602b96f359fea17c12226f9d3e86897b7339a23866cb0af

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