Malicious PDF — malware analysis report

Static analysis result for SHA-256 137e279b498c43e5…

MALICIOUS

PDF

31.0 KB Created: 2020-08-25 03:29:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 8beedfeef289b668ff1231d6b15e387c SHA-1: fd8d6102b15d5891246019a9a2d663f4dea6d5fc SHA-256: 137e279b498c43e5c71c8b84f0b1a8ad033a6eab3adf6799113d60aee64ab386
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to a redirector URL (ttraff.ru). The document body, though heavily obfuscated, contains text suggesting it is a 'Carrier heat load calculation excel sheet', a common lure for phishing or malware distribution. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it's a link farm designed to redirect users.

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=carrier+heat+load+calculation+excel+sheet In PDF document text
    • http://files.caymanpensionwatch.com/uploads/1/3/2/3/132303235/kifasugug.pdfIn PDF document text
    • http://files.mckenzieareadayhomes.com/uploads/1/3/1/4/131453894/937327.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/1/0427/7587/1654/files/35763433832.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/7667/3946/files/17736575835.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/2155/6117/files/68247342669.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/blood_domain_cleric.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/8234/2815/files/celtic_alleluia.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/5645/6095/files/71855321949.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0429/4692/0615/files/rulukufadokopefezi.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0437/7139/6257/files/degulose.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/51994241049.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2437/5194/files/57010312331.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 6

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_off00003edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3EDB 5000 bytes
SHA-256: 9efdaaa8f81ad9b89b855f832aeb229aa12e2ac85e99cf0e7748d5b2b7f2fff8
font_01_sfnt_off00004fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4FD0 9156 bytes
SHA-256: d7632ead673aa283e3560d8dfc9805f89df7d6effa350fe47c380116a9046e8e

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