Malicious PDF — malware analysis report

Static analysis result for SHA-256 37bc31d1bb0a8dc4…

MALICIOUS

PDF

46.8 KB Created: 2020-08-19 03:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-05-08
MD5: 41a1dfde1f84cb175a88ac42051c57f7 SHA-1: 82c07cbb15b8bc566dfd9c6cb6bc98171ddbcb3a SHA-256: 37bc31d1bb0a8dc473ead39a7665571d1e97853e66681874044da58fac9fc919
194 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with one specifically pointing to a known malicious redirector. The heuristic firings indicate the document is a malicious redirector and part of a link farm. The presence of numerous Shopify-hosted PDF links suggests an attempt to obscure the malicious destination and potentially leverage SEO tactics for distribution. The document body itself is heavily obfuscated and contains the malicious URL.

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=synonyms+and+antonyms+list+pdf In PDF document text
    • http://tetixu.kriswongbarrie.com/uploads/1/3/1/3/131384401/besarogupevimesa.pdfIn PDF document text
    • http://files.ijcmsr.com/uploads/1/3/0/7/130775952/kimen-lijiwujop-poxijugunoguz.pdfIn PDF document text
    • http://files.donigianproperties.com/uploads/1/3/0/9/130969633/9722842.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/1/0434/6006/7480/files/rutefiletazediximitute.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0438/1350/3133/files/rulunar.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0451/7868/3541/files/homogeneous_differential_equation_problems_and_solutions.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0430/6019/9573/files/12223246372.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0432/9121/3988/files/fibeferawitodubibibexaku.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0431/5637/3659/files/86712001203.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/6845/6088/files/anodizing_aluminium_process.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0434/3883/3816/files/bestiary_6_pathfinder_download.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0452/5889/9617/files/jizotiteniroduderafiwu.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0433/2499/7800/files/14703524024.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 5

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_off00007a48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7A48 5296 bytes
SHA-256: f029060c0fea5fc6e562ad6c0e0e6dc0c2c4840d583ea7cccdc6c7fa2f613591
font_01_sfnt_off00008c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C40 10020 bytes
SHA-256: 2dec1570f4211ac1b7c1bafc86d4cffc6156338ff2ca35355fb29d763192af06

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