Malicious PDF — malware analysis report

Static analysis result for SHA-256 2e581e53ce86492f…

MALICIOUS

PDF

53.3 KB Created: 2020-08-12 09:27:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f0466fc9775f64dcb2e36b9115b2d2c1 SHA-1: 25fa2b4ea6670f7673ad8e6501b0cc2ec82443fd SHA-256: 2e581e53ce86492f39d14fde46aa59705dabf2da0084f0a79aca95d91f51ba46
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded links, with one critical heuristic identifying a link to a known malicious redirector infrastructure at "https://ttraff.ru/pify?keyword=bennett+mechanical+comprehension+test+pdf+download". Another heuristic indicates a PDF link farm, suggesting an attempt to distribute malicious content or SEO spam. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=bennett+mechanical+comprehension+test+pdf+download
    • http://wunol.finewatergems.com/uploads/1/3/2/6/132695492/luxukika.pdf
    • http://files.rebeccaaranyi.com/uploads/1/3/2/7/132740375/suxurudinak.pdf
    • http://files.carolinerosenblum.net/uploads/1/3/1/3/131379919/39c0a0639.pdf
    • https://cdn.shopify.com/s/files/1/0440/3511/3110/files/mokonevinulu.pdf
    • https://cdn.shopify.com/s/files/1/0434/6111/6064/files/cambridge_igcse_combined_science.pdf
    • https://cdn.shopify.com/s/files/1/0433/6589/2261/files/tesobokedar.pdf
    • https://cdn.shopify.com/s/files/1/0431/7921/2959/files/68440234156.pdf
    • https://cdn.shopify.com/s/files/1/0432/6742/4412/files/zudimudibanozutugiworet.pdf
    • https://cdn.shopify.com/s/files/1/0435/5745/3985/files/personality_disorders_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7361/files/zakiremeso.pdf
    • https://cdn.shopify.com/s/files/1/0427/3415/7991/files/munixuxabu.pdf
    • https://cdn.shopify.com/s/files/1/0433/2394/9224/files/vasudevan_biochemistry.pdf
    • https://cdn.shopify.com/s/files/1/0428/8721/7319/files/basic_c_language_programs.pdf
    • https://cdn.shopify.com/s/files/1/0432/8731/4590/files/60096061373.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/

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006eaa.bin
467d9406dcf3bee295c1878b8aebed9a8b468987e9f611bc0570b5ab7955aaec		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6EAA 5324 bytes
font_01_sfnt_off00008093.bin
d969bea91ce9e9429fba5df87aedcd39ff0b2a47a30d66d309845c67c44432b0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8093 10576 bytes
font_02_sfnt_off0000a4ce.bin
ea75db71c9df7250347a03039f742fcd189f5fc3f08964e696816fa8b5227073		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA4CE 16092 bytes
font_03_sfnt_off0000b996.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB996 4324 bytes

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