Malicious PDF — malware analysis report

Static analysis result for SHA-256 352d42eef5bdcd2d…

MALICIOUS

PDF

57.4 KB Created: 2020-08-24 04:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3394272192144673754a1f133582a8ad SHA-1: 8d73b4fb9ad0d43bade930ae6159f597f716d0e2 SHA-256: 352d42eef5bdcd2d583c06ce6a859d5de6da438a820f4416c67fd372195badf4
152 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The presence of numerous other PDF links, many hosted on Shopify, indicates a potential link farm or SEO poisoning tactic to obscure the malicious destination. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.com/pify?keyword=alisha+chinai+songs++320kbps
    • http://files.capedingo.com.au/uploads/1/3/2/8/132815365/ruvefugegobodoxezi.pdf
    • http://botevefev.cosmicsistershop.com/uploads/1/3/2/7/132712237/4c47ecdde78.pdf
    • https://cdn.shopify.com/s/files/1/0429/5042/6787/files/treatment_guidelines_for_strep_pharyngitis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1423/4016/files/kodomilurarezarivafamovaj.pdf
    • https://cdn.shopify.com/s/files/1/0428/9763/7535/files/68960109817.pdf
    • https://cdn.shopify.com/s/files/1/0429/9377/8837/files/90052313630.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/kevaziretojigadogikoranab.pdf
    • https://cdn.shopify.com/s/files/1/0431/9005/9157/files/gta_vice_city_crack.pdf
    • https://cdn.shopify.com/s/files/1/0437/5920/6558/files/animal_farm_full_text.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_off00009480.bin
e1c71d15b3e35da93ad2967a839ab66ab918f2f08eee93d8c147bd687ec06540		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9480 5732 bytes
font_01_sfnt_off0000a7e3.bin
127dd42e687ec28cf75147c4e7efbe427949f55f94aff1947b472e4c94da73a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7E3 15612 bytes

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