Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fa38bc82eaedc32…

MALICIOUS

PDF

35.8 KB Created: 2020-08-18 19:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e8de89d6b5442502445ab02dd3cc9ba5 SHA-1: cabac229fa38e6ca6e3aaba8c9dd91f5484d2f02 SHA-256: 9fa38bc82eaedc320d54203dc50b09498512f04f728d86fb6a18e5c4eb4e40e5
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is likely intended to lead the user to a malicious site. The document body, though heavily obfuscated, contains the string 'admin panel roblox' and a URL that appears to be part of a link farm. The ML classifier also strongly flagged this PDF as malicious.

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=admin+panel+roblox
    • http://files.cozycatsanddogs.com/uploads/1/3/1/4/131406662/17b591e95d.pdf
    • https://cdn.shopify.com/s/files/1/0434/7658/2550/files/zijaranitugojewupula.pdf
    • https://cdn.shopify.com/s/files/1/0430/0118/4417/files/23269422648.pdf
    • https://cdn.shopify.com/s/files/1/0431/3337/0529/files/bonefish_grill_menu.pdf
    • https://cdn.shopify.com/s/files/1/0438/3450/7424/files/alkaloids_in_medicinal_plants.pdf
    • https://cdn.shopify.com/s/files/1/0432/7338/8190/files/97929271779.pdf
    • https://cdn.shopify.com/s/files/1/0435/5152/2977/files/90398248062.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/96672573922.pdf
    • https://cdn.shopify.com/s/files/1/0434/2333/4565/files/gosivuxudepobe.pdf
    • https://cdn.shopify.com/s/files/1/0432/3721/2319/files/photosynthesis_and_cellular_respiration_quiz_9th_grade.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004e28.bin
433e5286662821668e666dc1b10175dffb42d6a6eb9ce5e93df4f40abe140d06		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E28 5124 bytes
font_01_sfnt_off00005f73.bin
d89ce3d7d0f383c1cef8b952a7aca6f46caa6e58afe3b369e0b8c015cbd802ad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F73 10500 bytes

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