Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5637f2ce4cea4de…

MALICIOUS

PDF

141.0 KB Created: 2020-08-11 23:26:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 2ca64a40a95745db65882c20ca3c4cf7 SHA-1: db3076257be0b41d0b7ff5a6e51d4b6eec7b3c92 SHA-256: f5637f2ce4cea4deffb548dd6e806cdc3b52b517cd2c49f73cd195f549806365
194 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.ru'. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The overall pattern suggests a phishing attempt disguised as a document download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/wb?keyword=sir%20gawain%20and%20the%20green%20knight%20pdf%20line%20numbers In PDF document text
    • http://ripufefoz.davidkalal.net/uploads/1/3/1/3/131380429/9043953.pdfIn PDF document text
    • http://files.ktsky1.com/uploads/1/3/1/4/131455463/3656823.pdfIn PDF document text
    • http://files.hornehastingsgourmet.com/uploads/1/3/0/9/130969825/3772933.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/1/0451/3605/2389/files/january_2020_to_august_2020_current_affairs_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/3033/1039/files/gst_tax_slab_for_ay_2020_19.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/u_with_acute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/3197/0460/files/pirelabuxixagul.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/8852/7013/files/76684048499.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/4790/1592/files/gativazanogukamino.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0439/1842/6267/files/revista_cero_en_conducta.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/2859/4336/files/vexufilomawomokujugudisa.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/40814320730.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/9359/0170/files/telegram_football_star_game_cheat.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 3

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_off0001ef21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF21 5852 bytes
SHA-256: 20ab44a5a2d7d876bbc724bf5aa27cedc11cdcf1263ee57b738c74d864d3e410
font_01_sfnt_off000202e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202E6 10332 bytes
SHA-256: d0431c64086b9f9786ed263492283f5b16204e685893abb04d40a41f4142696e

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