Malicious PDF — malware analysis report

Static analysis result for SHA-256 88a816be72e58192…

MALICIOUS

PDF

40.9 KB Created: 2020-08-31 00:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b39f7cd898d5a250b87ecfd7bd3f915 SHA-1: 68ae6db7984370238aa5191ca66e69cdad59df8f SHA-256: 88a816be72e58192e180bb6b6ddd7bc2dd9daf3e49f90fe6d0d050d67c670d30
150 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.com'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector appears to be luring the user to the malicious redirector via the embedded link.

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.com/wix?keyword=fotolectura+paul+scheele+pdf
    • https://static.usrfiles.com/ugd/77d535_8bbb81908e34419088586fa68503b71e.pdf
    • https://static.usrfiles.com/ugd/1be480_9bb0bede4f614e0883a3320166a9159a.pdf
    • https://static.usrfiles.com/ugd/4bb894_e48de78831434e23ab50dd98bbc754e8.pdf
    • https://static.usrfiles.com/ugd/b8c837_02aa42f81d644e0993de17950c2cb1a6.pdf
    • https://static.usrfiles.com/ugd/b8c837_478ef8dea919480d9464e6ab8d2cf77f.pdf
    • https://static.usrfiles.com/ugd/2f8cea_730753450e364970a3cf37cffe07df2a.pdf
    • https://static.usrfiles.com/ugd/0d9a50_1b88006f885d49fa8e5bfbd1625d16c3.pdf
    • https://static.usrfiles.com/ugd/735424_b58a776e8ec84bb6947c3c1e393b31c2.pdf
    • https://static.usrfiles.com/ugd/b8c837_a4e3ef6c714e46d79401bf9f7593084a.pdf
    • https://static.usrfiles.com/ugd/455f95_b8ae02afa42540528705df6ef640c0ca.pdf
    • https://static.usrfiles.com/ugd/3eed2b_8c25e3244ae64ab3b02bffaf610ae886.pdf
    • https://static.usrfiles.com/ugd/b8c837_c558f0fe94124d7e8cb83514f51fbdba.pdf
    • https://static.usrfiles.com/ugd/e2f7e1_5f9f63f3876a4bdbbc8348a7a6afd487.pdf
    • https://static.usrfiles.com/ugd/a6e5e9_b4e3407f249e49999df5ce630fe585e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_e1973744e4844790b9d1f559f1a097b0.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_off00006356.bin
94d923b69f63fe2d4234cd3ecef81b487cc3c24afa4197d9dba3e072ced3457b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6356 5196 bytes
font_01_sfnt_off000074f8.bin
7e2e960e366b7a10092dbf1c33a27b48acb2e49957ba0f99005057c80c614cb3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x74F8 9920 bytes

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