Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1262cdf6336307e…

MALICIOUS

PDF

33.5 KB Created: 2020-08-10 13:12:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: c6d92da62e00dba5080eda2e03d119e7 SHA-1: 81d5dd0b840dc61d8f623f5959708903988efe28 SHA-256: b1262cdf6336307e4d442f39dca8a7afdde025b0d8f209c69a0f686f85338a7f
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a significant number of embedded links, many pointing to Shopify domains hosting other PDFs, indicative of a link farm. One critical heuristic identified a link to known malicious redirector infrastructure at 'ttraff.ru'. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern appears to be SEO manipulation or redirection to malicious content.

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=b+pharmacy+colleges+in+maharashtra+list+pdf In PDF document text
    • http://files.sharodickerson.com/uploads/1/3/1/3/131383247/xapawupono.pdfIn PDF document text
    • http://jipatibez.radiantearthling.com/uploads/1/3/1/0/131071164/1078375.pdfIn PDF document text
    • http://files.morganephotos.com/uploads/1/3/2/6/132681887/dc8ca12901.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/1/0438/6488/3355/files/63847270178.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9376/1941/files/simple_past_continuous_tense_exercises_with_answers.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/9017/3333/files/nisesodosopani.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2514/5760/files/repigiwa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/5507/7790/files/74976490415.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4883/6004/files/8361422679.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/1095/7210/files/gabexukekawixoxokel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3801/4616/files/gomujiwobiposirubaruko.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7709/7886/files/dobesosigej.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0436/6820/9817/files/84597519677.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/4693/5460/files/49660421595.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 5

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_off00004499.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4499 5720 bytes
SHA-256: 9e6fd43ac86de1921c6846b2a57d99d5c14e33bffeecb3db0e19ad5b3aa51c68
font_01_sfnt_off000057e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57E5 9712 bytes
SHA-256: 78cc29fa9710a40821b785f3b6919719ed5d6f72dc6c4107f0a46ead8c82cd56

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