Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd85ca7530b5f6c2…

MALICIOUS

PDF

43.1 KB Created: 2020-08-04 16:42:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 96d2933d58ff922d306f61c24d6ce981 SHA-1: 2ec076095493560f9f3f3f8d3731e5a2a29a1b94 SHA-256: bd85ca7530b5f6c2dd3b04a8b6d2a6325f866cbbfcb9c41af57e29684c315e13
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to Shopify domains hosting other PDFs, which is indicative of a link farm designed to obscure malicious redirectors. The primary malicious URL identified is https://ttraff.ru/pify?keyword=ho+chi+minh+city+guide+pdf. The document body text, though heavily corrupted, suggests a lure related to a 'Ho Chi Minh City guide PDF'. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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=ho+chi+minh+city+guide+pdf
    • http://files.disarmingdoomsday.com/uploads/1/3/1/0/131070597/xegiw.pdf
    • http://files.kcrowell.com/uploads/1/3/0/8/130814636/tawagujoj.pdf
    • http://files.palliativecarefordham.com/uploads/1/3/0/7/130775649/texuxo.pdf
    • https://cdn.shopify.com/s/files/1/0429/5219/6249/files/denuputejogan.pdf
    • https://cdn.shopify.com/s/files/1/0430/9755/5108/files/kalirutufamisavanival.pdf
    • https://cdn.shopify.com/s/files/1/0431/6761/3087/files/vobivepuxovusesaxijokinoz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zofes.pdf
    • https://cdn.shopify.com/s/files/1/0430/1619/2153/files/17858742229.pdf
    • https://cdn.shopify.com/s/files/1/0427/4061/3286/files/misinoduxiwabovof.pdf
    • https://cdn.shopify.com/s/files/1/0430/4361/8965/files/12191092213.pdf
    • https://cdn.shopify.com/s/files/1/0429/5573/5193/files/66645647604.pdf
    • https://cdn.shopify.com/s/files/1/0429/5114/7676/files/91903423189.pdf
    • https://cdn.shopify.com/s/files/1/0427/8039/3639/files/indiana_jones_song.pdf
    • https://cdn.shopify.com/s/files/1/0427/4746/1788/files/tabajidejolitobuvazogos.pdf
    • https://cdn.shopify.com/s/files/1/0431/7016/8986/files/20991159381.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_off00006c41.bin
86d3845ed063a987706027469fdb8a222964085cb41e40dd47d815a4538c65be		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C41 5116 bytes
font_01_sfnt_off00007d96.bin
042c4e047ba5eb52735053402748472ecc76bf462917c557c835b0397537704d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D96 9908 bytes

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