Malicious PDF — malware analysis report

Static analysis result for SHA-256 a820244f7855919e…

MALICIOUS

PDF

36.6 KB Created: 2020-08-16 10:55:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4c9b9c8534f12a5efae054d82f5ecc58 SHA-1: cec04f0c629e85f3697e51b8b1ca4ce199ef081f SHA-256: a820244f7855919ef1fe129697a98840725467e9bc4a119a4ecb94003d948105
120 Risk Score

Malware Insights

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

The PDF file contains multiple embedded links, with a critical heuristic firing for a malicious redirector. The document body, though partially garbled, mentions 'Audi q5 2014 mmi manual', suggesting a lure to entice clicks. The primary malicious URL identified is ttraff.ru, which is used in conjunction with a search keyword, indicating a potential SEO poisoning or phishing campaign. The presence of numerous links, many pointing to Shopify-hosted PDFs, suggests a link farm designed to obscure the ultimate malicious destination.

Heuristics 3

  • 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.
  • 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=audi+q5+2014+mmi+manual
    • http://files.universalcareservicesllc.com/uploads/1/3/1/4/131408899/5111076.pdf
    • https://cdn.shopify.com/s/files/1/0431/5650/4744/files/bubepaz.pdf
    • https://cdn.shopify.com/s/files/1/0428/1624/1831/files/zabebomujefexitosam.pdf
    • https://cdn.shopify.com/s/files/1/0434/5253/0845/files/fesalizusinazobukodiwigo.pdf
    • https://cdn.shopify.com/s/files/1/0434/2602/1527/files/jabiroxizoma.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/solitaire_game_apps_free.pdf
    • https://cdn.shopify.com/s/files/1/0430/7730/4484/files/juzifemuju.pdf
    • https://cdn.shopify.com/s/files/1/0438/5597/0454/files/accelerated_learning_crash_course.pdf
    • https://cdn.shopify.com/s/files/1/0428/4396/3548/files/17284949829.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_off000051f1.bin
6d7069640ab63cb9407f8a6171072672513689c73dfb06aaa6ed8f3bd96dfa51		 pdf-font-stream PDF embedded font (sfnt) at offset 0x51F1 5352 bytes
font_01_sfnt_off0000641e.bin
244d5d1bfc520ddc603b0793943f7e027ad2c7742b3da973293d8b6ca1f1da64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x641E 10048 bytes

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