Malicious PDF — malware analysis report

Static analysis result for SHA-256 814651c5d6b53059…

MALICIOUS

PDF

42.9 KB Created: 2020-08-10 19:43:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fed371c669af53163fb849ace0e61802 SHA-1: 0372785492fd6bda5937c554344aee605891024a SHA-256: 814651c5d6b530597771dfb1b940c1c80ea8f359d4ba7df027574f9ca87abbfb
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/pify?keyword=pdf+file+sample+free+download'. It also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm designed to attract traffic. The ML classifier strongly flagged this PDF as malicious, supporting the conclusion that it is used for malicious redirection.

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.cc/pify?keyword=pdf+file+sample+free+download
    • http://files.habamania.com/uploads/1/3/2/6/132695602/1994932.pdf
    • http://files.feedingmyohana.com/uploads/1/3/1/8/131871787/9e912e5fb41f.pdf
    • http://files.pascarellabros.com/uploads/1/3/2/6/132682851/nezaxuputo-nobadij-derurefalipu-jugajotufezim.pdf
    • http://files.starstatusboxingpa.com/uploads/1/3/0/7/130775362/warezuf.pdf
    • http://xagebefik.savoyaires.org/uploads/1/3/0/9/130969656/1632803.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9232/0161/files/vodilugotetawuj.pdf
    • https://cdn.shopify.com/s/files/1/0427/8855/2870/files/5669607256.pdf
    • https://cdn.shopify.com/s/files/1/0433/5307/9963/files/the_acid_alkaline_food_guide_susan_brown.pdf
    • https://cdn.shopify.com/s/files/1/0428/7922/1927/files/63148347720.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/58143530911.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zozaweguxilamefawe.pdf
    • https://cdn.shopify.com/s/files/1/0432/0228/1633/files/9380528652.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/gumuwajufutoz.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61086590007.pdf
    • https://cdn.shopify.com/s/files/1/0430/7301/1866/files/98195255018.pdf
    • https://cdn.shopify.com/s/files/1/0434/6707/9830/files/amazon_fba_2020.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_off00006979.bin
edc8cfb908f309bc1bf4da96014097834f2e2e5182a4403911f2929d3b07db6a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6979 5280 bytes
font_01_sfnt_off00007b67.bin
ad4c68464095510e63b40e407671c8ee56d694af57ebce38d2a861b4224cece8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B67 10332 bytes

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