Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c85f31b9d563499…

MALICIOUS

PDF

35.8 KB Created: 2020-08-11 05:18:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-09
MD5: a4883b1774ddb43c69e200193d52ce2d SHA-1: 5bcc3abe78ef3229d9a03f2604d14aea0baa7135 SHA-256: 7c85f31b9d563499114e7e4ba5e40343b3cc538ab2f47b5fbfe9e9c09c965b3a
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to a redirector service (ttraff.ru) that is flagged as malicious. This indicates a phishing or scam attempt, likely using the guise of offering a book download to trick users into clicking malicious links. The ML classifier also strongly flagged this PDF as malicious.

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=regional+anesthesia+book+pdf In PDF document text
    • http://files.wildeaboutexploring.com/uploads/1/3/1/4/131407135/80581.pdfIn PDF document text
    • http://files.grandeprairierugby.com/uploads/1/3/1/4/131406412/vufiluxakezej.pdfIn PDF document text
    • http://files.taiwan-america.org/uploads/1/3/1/4/131454466/862401.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/1/0428/9835/8432/files/dosoxuwananeworatimuk.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/7427/3948/files/integrated_resistors_and_capacitors_in_vlsi_design.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8833/9361/files/67071709256.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/9110/7752/files/9466753762.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/1035/1513/files/caldwell_luc_procedure.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/0814/8127/files/48439018955.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9201/7305/files/79176934935.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2561/3468/files/33421419640.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/5131/0488/files/kuwuzimad.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/2672/7580/files/71227009996.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/8094/1721/files/mivikurejesifawufarawod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/5896/0286/files/variable_expressions.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 8

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_off00004bf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF6 5420 bytes
SHA-256: 30d9516b876de9ac62152124f272d581935b5587df35c2e9af5e0dfab9ce2c07
font_01_sfnt_off00005e61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E61 10656 bytes
SHA-256: 883e736de559ebd5266cbd670c3c90102950449fac4a421a64a25533020a7e89

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