Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7b070c6034ee567…

MALICIOUS

PDF

50.9 KB Created: 2020-08-28 21:22:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f75d0fe0728c48a9818ce3bbb8c667b3 SHA-1: 0872b0230242d3624e5a1731d6ef4268caf16370 SHA-256: c7b070c6034ee567778e2bfd62bb4f7604e1a5158e903575240835bf546d9612
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. Additionally, it exhibits a PDF link farm behavior with numerous external links, many hosted on static.usrfiles.com and cdn.shopify.com. The ML classifier strongly indicated maliciousness. The document body itself is largely unreadable binary data, but the presence of the malicious URL and the link farm structure suggest an attempt to lure users to potentially harmful content or manipulate search engine rankings.

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.com/wix?keyword=quest%25C3%25B5es+discursivas+sobre+a+ditadur
    • https://static.usrfiles.com/ugd/b8c837_ecdd369a514c4b62820ed775c77ba857.pdf
    • https://static.usrfiles.com/ugd/b8c837_b04b151de58545ecbe6dbab3f5d30991.pdf
    • https://static.usrfiles.com/ugd/b8c837_9b344450f25b49bf95e1d2fa05b85f01.pdf
    • https://static.usrfiles.com/ugd/b8c837_15b2830db5804f10a4d84a83cd59a3a4.pdf
    • https://static.usrfiles.com/ugd/b8c837_b0c8a07c63bc4490848aecc2d8d2a1b7.pdf
    • https://cdn.shopify.com/s/files/1/0438/3057/5266/files/1419793257.pdf
    • https://cdn.shopify.com/s/files/1/0437/7352/6178/files/77684178158.pdf
    • https://cdn.shopify.com/s/files/1/0434/3486/8897/files/birthday_chocolate_cake_pictures.pdf
    • https://cdn.shopify.com/s/files/1/0431/8317/7887/files/jolexofotizibavepunogax.pdf
    • https://cdn.shopify.com/s/files/1/0433/8168/6439/files/47269824961.pdf
    • https://cdn.shopify.com/s/files/1/0438/9791/3512/files/kusupunenofifexomo.pdf
    • https://cdn.shopify.com/s/files/1/0437/8319/2738/files/tibivefopotegevipa.pdf
    • https://cdn.shopify.com/s/files/1/0438/4446/8898/files/watch_faces_for_apple_watch.pdf
    • https://static.usrfiles.com/ugd/b8c837_fbdc8e6b6902448cb83e89134be9ba4f.pdf
    • https://static.usrfiles.com/ugd/b8c837_79db1b3cedb34562867ac8531568f8aa.pdf
    • https://static.usrfiles.com/ugd/b8c837_57a055deee8445489e7134244864cbe1.pdf
    • https://static.usrfiles.com/ugd/b8c837_d3b3e9e6523146d191ab8bd65508d732.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_off00008395.bin
7002402d6b4a488b489231934fab4f76e3360568b352a3b73672d277802ebb90		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8395 5380 bytes
font_01_sfnt_off000095a8.bin
dd27313bbc073c48598336c312c22fff0724350b69bf14289e98619359b1946c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x95A8 12764 bytes

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