Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc210887696fb68a…

MALICIOUS

PDF

54.6 KB Created: 2020-08-31 12:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 16a9e50aeea5cebc621f21717a028664 SHA-1: 984ed3bb73a066e21b9436edf958190d5bdc815e SHA-256: fc210887696fb68aa51de9fd271652e18881c5cbf7ff0ba83255fb4413b2fb89
152 Risk Score

Malware Insights

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

The PDF contains a link to 'ttraff.com' which is flagged as a malicious redirector. The document body, though heavily obfuscated, contains text related to 'Left 4 dead walkthrough' and the malicious URL, suggesting a lure to a malicious site. The presence of numerous external PDF links further indicates a link farm or redirection strategy.

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=left+4+dead+walkthrough
    • https://static.usrfiles.com/ugd/dad90e_7e1efd230e494f0fba43c7c346fecb9e.pdf
    • https://static.usrfiles.com/ugd/5be868_167d5de530c741bd8a375bc4cb633389.pdf
    • https://static.usrfiles.com/ugd/314c35_b496dfbc110b4bd5a8762d495fb47b9e.pdf
    • https://static.usrfiles.com/ugd/856cea_6ffc047754a14d7397180e15b3e12798.pdf
    • https://static.usrfiles.com/ugd/726ec9_7af24d74841e4b1ea2309e1e4bc109fd.pdf
    • https://static.usrfiles.com/ugd/1d64af_4294c0a1bf7c4c3e96141394d612a83c.pdf
    • https://static.usrfiles.com/ugd/dad90e_f49cf0baf45e4ef085cb0bed8c5cb856.pdf
    • https://static.usrfiles.com/ugd/98857b_5f1de098fee942a682b4a6f8b14cd205.pdf
    • https://static.usrfiles.com/ugd/0779a3_46d944ad69ab43b58097c6f404471fb9.pdf
    • https://static.usrfiles.com/ugd/61f964_e5df70fa37b641309e4c3e126b907544.pdf
    • https://static.usrfiles.com/ugd/c1de29_2d4c6a6fc30642038ad390e00e0b0ef6.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffdba306e8c349b2bb3b062d0249fb7e.pdf
    • https://static.usrfiles.com/ugd/b8c837_019096de12f24e95a47cbc0fdde67012.pdf
    • https://static.usrfiles.com/ugd/29c71c_9021f131e8774c04a2a1cfcb354c9b92.pdf
    • https://static.usrfiles.com/ugd/b8c837_73d44f7e83164624909aa3b40919c01f.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_off0000988f.bin
e19fc7eb9aed4fc2911f831553911ce41cbd93911f1fe3de5950ad01788f8a57
pdf-font-stream PDF embedded font (sfnt) at offset 0x988F 5176 bytes
font_01_sfnt_off0000aa47.bin
a7ee0b268a9a65b6b23fd937c768c238f2487ab1dfa92c8918c20e7c66a37b8f
pdf-font-stream PDF embedded font (sfnt) at offset 0xAA47 10500 bytes