Malicious PDF — malware analysis report

Static analysis result for SHA-256 04559444bd8b2315…

MALICIOUS

PDF

41.3 KB Created: 2020-08-20 06:04:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6825b5a9b44b6dc7701865511a583d91 SHA-1: 190bae479f4ee7e807875bd8e838ed427f23cd02 SHA-256: 04559444bd8b23154700f98641ab59bde50e1e45f377214b3f76d8ceb53f7d37
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, with one identified as a malicious redirector. The ML classifier also flagged this PDF as malicious. The document body, though heavily obfuscated, contains references to the malicious URL and other Shopify links, suggesting a link farm or redirection scheme to distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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=digital+business+concepts+and+strategies+pdf
    • http://pexofa.oceancityweddings.com/uploads/1/3/1/3/131383314/busib.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/5375/1189/files/suzikidasuwit.pdf
    • https://cdn.shopify.com/s/files/1/0438/3670/2870/files/mozetapu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7180/7396/files/79844351718.pdf
    • https://cdn.shopify.com/s/files/1/0432/5107/3174/files/anticoagulant_used_in_blood_bank.pdf
    • https://cdn.shopify.com/s/files/1/0433/5117/9416/files/69129544285.pdf
    • https://cdn.shopify.com/s/files/1/0427/8072/1311/files/investigacion_descriptiva_que_es.pdf
    • https://cdn.shopify.com/s/files/1/0435/5319/4133/files/zasag.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/21659337375.pdf
    • https://cdn.shopify.com/s/files/1/0428/7909/0855/files/woman_body_parts_name_with_picture_in_english.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006376.bin
8f0bcce13b218f74ad3c3e52429269c80ad9715efb08712a50b2e057e7b41af9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6376 5464 bytes
font_01_sfnt_off0000760a.bin
453ac32c9f541fad4c46371d87ebd75f33bd3b33498d40a2df7da1c7b4730330		 pdf-font-stream PDF embedded font (sfnt) at offset 0x760A 10152 bytes

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