Malicious PDF — malware analysis report

Static analysis result for SHA-256 a521659020b40bcf…

MALICIOUS

PDF

35.2 KB Created: 2020-08-25 05:08:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-07
MD5: 03fa55556fe69de053b165586f7db922 SHA-1: eb10ce781967947073b9b033a1ace9abe7637983 SHA-256: a521659020b40bcf3a1f4b5ea5379948e2a6ac8bf4579537230a9c7e4b650ab3
194 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.ru/pify?keyword=architectural+drawing+course+mo+zell+pdf'. This URL is embedded within the document's body text, disguised as a course material. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be social engineering via a deceptive link.

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=architectural+drawing+course+mo+zell+pdf In PDF document text
    • http://files.ceramicsmaui.com/uploads/1/3/1/4/131453917/2628574.pdfIn PDF document text
    • http://jetunax.calaverasarts.org/uploads/1/3/2/7/132741100/3500105.pdfIn PDF document text
    • http://files.colchester-therapies.co.uk/uploads/1/3/1/0/131070674/5785390.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/1/0435/4077/5064/files/xajajajubozumurukalaw.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5815/1072/files/92528511936.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/mapiguwidekedod.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/4310/2613/files/wosotimebadi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5340/8675/files/getiwukel.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0440/2610/1925/files/donation_receipt_template_canada.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/5877/3662/files/21638937678.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/7692/7141/files/tuzekaduxolegedugudujo.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/3117/4039/files/dueling_laser_gungeon.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_off00004bf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF3 5700 bytes
SHA-256: b461b8503e365d9ea42656b8115b0d5b89b3dd0239be2beaea987d5bb24cca60
font_01_sfnt_off00005f4c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F4C 9608 bytes
SHA-256: 10e4259c59140b5bb64b4dcab2c7501d2b0ba882bc513f94c857672483a8ebcc

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