Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbb39b389dd56e20…

MALICIOUS

PDF

45.3 KB Created: 2020-08-19 23:05:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1323c145aaf37d87f8aca6b4382b9c33 SHA-1: f6c55638ebdbac9c6d76cdb5a43f7373f525b547 SHA-256: fbb39b389dd56e202f002e5ae9a2a2e3db0e6e987d067c4a172eaf9122cb2a35
152 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text that appears to be a lure for a game, combined with the redirector URL. The presence of numerous Shopify-hosted PDF links suggests a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly indicated maliciousness.

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=doodle+god+main+game+answers
    • http://files.shellycooklpc.com/uploads/1/3/2/6/132683292/visapi.pdf
    • https://cdn.shopify.com/s/files/1/0431/6784/2465/files/51188658471.pdf
    • https://cdn.shopify.com/s/files/1/0430/9801/3845/files/86361888653.pdf
    • https://cdn.shopify.com/s/files/1/0428/9658/8967/files/93126129274.pdf
    • https://cdn.shopify.com/s/files/1/0434/9162/3077/files/34726945336.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/warobapisuge.pdf
    • https://cdn.shopify.com/s/files/1/0430/8402/1921/files/59765930582.pdf
    • https://cdn.shopify.com/s/files/1/0428/7689/5398/files/lagarexokadetobet.pdf
    • https://cdn.shopify.com/s/files/1/0434/5469/3529/files/91826657745.pdf
    • https://cdn.shopify.com/s/files/1/0434/5135/1197/files/accp_warfarin_dosing_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0433/2997/8526/files/sulotumejodofelitidazab.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_off00007430.bin
e1fbab2315f6485cbc48e06a1e4819f4291adfcd5f2161d0197eba38cbcbd63e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7430 5236 bytes
font_01_sfnt_off000085fe.bin
b77cccfb06af64a51bfe10d662047b97ec60ae633b305eb899ebfb0f41834d21		 pdf-font-stream PDF embedded font (sfnt) at offset 0x85FE 10280 bytes

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