Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f4e2e955d626b1…

MALICIOUS

PDF

58.8 KB Created: 2020-08-20 18:27:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 169555c5b7e071b55e5cc758c02f14fd SHA-1: 1e71cfc217ce502f963ea8e844888696860ba698 SHA-256: 91f4e2e955d626b18de5673640044ee39db2e163a5694d318d7f5b2257d2a564
194 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised as a "final commissioning report sample". The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains the same URL, reinforcing the lure. The presence of numerous links to external PDFs, many hosted on cdn.shopify.com, suggests a link farm used for SEO poisoning or to host further 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=final+commissioning+report+sample In PDF document text
    • http://files.backwaterinc.com/uploads/1/3/1/8/131856723/kojazubupirafu-xekokunex-fixedag-panutofomod.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/1/0438/2274/3709/files/anthropology_study_guide.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/42539854631.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6279/6186/files/englisch_aufgaben_simple_past.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1110/5183/files/97615710418.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/2150/8509/files/64548720607.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2761/1300/files/32300510867.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/0078/9154/files/soda_crack.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5850/3573/files/69402544877.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/8606/7352/files/wapilir.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3111/7467/files/statistical_inference_garthwaite_jolliffe_jones.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 1

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_off0000aad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAAD3 5208 bytes
SHA-256: bd764a2682b0d86e8b743d0f489110ff6bfea2265dd6ec872a5b5ccc948ebe5a
font_01_sfnt_off0000bc6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC6D 9912 bytes
SHA-256: d6f15e9e1595acf2b0dbd51478ba634cabb17c6973010b71e890f3b51f80d8f8

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