Malicious PDF — malware analysis report

Static analysis result for SHA-256 c97c949e070b3257…

MALICIOUS

PDF

37.4 KB Created: 2020-08-14 21:11:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3054e82cc2d033e4844b02ffce7b8743 SHA-1: 42bfbb4ef14c7e3bb86473ae8e614c0980479d7c SHA-256: c97c949e070b325723dd0b0ec5a9f07708fb7d1f49c254824761feb417e40275
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.cc'. The document body, though heavily obfuscated, also contains this URL and numerous other links to Shopify domains, suggesting a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves luring the user to a malicious site via the redirector.

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.cc/pify?keyword=maple+leaf+rag+sheet+music+beginner
    • http://penefaze.simonedehaas.com/uploads/1/3/1/6/131637814/6154283.pdf
    • http://bavodex.insearchofgiants.co/uploads/1/3/2/7/132740214/tedilikamubumir-xigekemiwubexi.pdf
    • https://cdn.shopify.com/s/files/1/0431/2412/9946/files/38956888489.pdf
    • https://cdn.shopify.com/s/files/1/0430/8713/4882/files/tatewerurora.pdf
    • https://cdn.shopify.com/s/files/1/0437/7994/8705/files/17366854115.pdf
    • https://cdn.shopify.com/s/files/1/0433/5144/1560/files/32888200961.pdf
    • https://cdn.shopify.com/s/files/1/0429/5540/7511/files/64339619457.pdf
    • https://cdn.shopify.com/s/files/1/0434/4777/9478/files/xujiwazawivugiwabu.pdf
    • https://cdn.shopify.com/s/files/1/0431/0702/5056/files/gewurokowomomepimos.pdf
    • https://cdn.shopify.com/s/files/1/0434/0459/1255/files/98218772000.pdf
    • https://cdn.shopify.com/s/files/1/0437/9957/6733/files/sixakokoduwanizofosa.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_off000053e1.bin
d4704e002f4092840920d7903d7fe25917d3aab49424002490713f134c82b480		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53E1 5572 bytes
font_01_sfnt_off000066af.bin
069d0d527b6033a8f18d618a02fd8344e2fc0b37c6bec61c0af61c7e78dfed34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66AF 10060 bytes

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