Malicious PDF — malware analysis report

Static analysis result for SHA-256 771c31a4fb64a812…

MALICIOUS

PDF

70.5 KB Created: 2020-08-11 02:50:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: ae1d4b58334474ea053cca9f95b3f0c6 SHA-1: 468e0a9dd5b5d590ddc338ae08443d1f33324b1a SHA-256: 771c31a4fb64a81268479c6c7ddd9f4731167a0126a19fb1c38f94308afa5f97
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that point to a known malicious redirector, ttraff.ru, which is disguised as a search result for educational material. This suggests a phishing or malware distribution attempt. The ML classifier strongly indicates maliciousness, and the presence of numerous external PDF links further supports the SEO-based lure tactic.

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=6th+grade+english+textbook+pdf In PDF document text
    • http://files.nnis.net/uploads/1/3/1/4/131408581/2506419.pdfIn PDF document text
    • http://files.plantshopyyc.com/uploads/1/3/0/7/130776861/784c36a93399.pdfIn PDF document text
    • http://sudularo.bankslawyers.com/uploads/1/3/1/6/131607600/xadabu.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/1/0432/0083/9842/files/75653682116.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7220/0608/files/ruverinijikevodobilim.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5621/7750/files/37785397868.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2161/5775/files/24633297011.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7397/8011/files/29492498681.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/0649/2831/files/64028083888.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5116/2517/files/38776750304.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5322/5883/files/banogatatafive.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/0378/1015/files/broiler_chicken_vaccination_schedule.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/5925/6232/files/lulumavikosunifom.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4747/7667/files/77058187664.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 4

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_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 5636 bytes
SHA-256: 5f312fe0a6e7b8fd594a95812afd5599eab0c8449979acaf7895e6b8da2bd151
font_01_sfnt_off0000e3de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DE 13096 bytes
SHA-256: 6cc93ed478a4cf7de9db76833f4a3c10dfea45446eb93bbb9eb8270c3fff0a3f

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