Malicious PDF — malware analysis report

Static analysis result for SHA-256 cba3d5cfcb6f5c98…

MALICIOUS

PDF

39.1 KB Created: 2020-08-31 18:55:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 136625d5bd559bd3d62b24a1218a3442 SHA-1: b7c4b8d078b9fee36457703ba333cd1631d030c9 SHA-256: cba3d5cfcb6f5c981732a2c6d122cd9927eaac6dc5217d136bf87e759c88ebff
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing a malicious redirector link and a link farm. The embedded URL points to `ttraff.com`, which is identified as malicious infrastructure. The document body, though heavily obfuscated, contains this URL and references to other PDFs hosted on `static.usrfiles.com`, suggesting a coordinated effort to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=glueless+sheet+vinyl+flooring+adhesive
    • https://static.usrfiles.com/ugd/b8c837_758a16ec0518498996994908b41602d4.pdf
    • https://static.usrfiles.com/ugd/c068f8_0fe75227170e400d8a5e7b75e4667734.pdf
    • https://static.usrfiles.com/ugd/a2d007_e65aa7ca89794f25bda392c707c3d483.pdf
    • https://static.usrfiles.com/ugd/4b7290_6a014d182e8f43119b47e4c43cfe5c13.pdf
    • https://static.usrfiles.com/ugd/3ab5ed_9a7231486b9a41559b32e9834022c552.pdf
    • https://static.usrfiles.com/ugd/1e4819_b41666fa280946afbc44cfd4e692da49.pdf
    • https://static.usrfiles.com/ugd/b8c837_7ad9077bb1ae479a94ef372cc60da741.pdf
    • https://cdn.shopify.com/s/files/1/0432/4563/3691/files/11517673638.pdf
    • https://cdn.shopify.com/s/files/1/0430/7566/6073/files/new_bollywood_song_mr_jatt_2019.pdf
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/fovuwibalanovijevapix.pdf
    • https://static.usrfiles.com/ugd/804ff6_2e41c8e66dce47db951a29375452f336.pdf
    • https://static.usrfiles.com/ugd/8c2aca_645a40073cda458bb2bb7adf2a27a4e4.pdf
    • https://static.usrfiles.com/ugd/b8c837_4de5e67f14e94c7e8dc57bb5a917e810.pdf
    • https://static.usrfiles.com/ugd/99afdc_c037aa6f029f41e79c161956d0448346.pdf
    • https://static.usrfiles.com/ugd/b7082a_1d7e8cd59b034ab5b75b0d03e9e634f1.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d16.bin
6652861c84354a7851651711b3cffa29c679a4ccfaa97dc5f742846a6c97ad02		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D16 5244 bytes
font_01_sfnt_off00005ef0.bin
994626fa3d9187c5f0e6d917d6d7d2c3e6204c5930d67010fafe5baa02d8de8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EF0 9988 bytes
font_02_sfnt_off00008130.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8130 4324 bytes

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