Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bcc85e823296ede…

MALICIOUS

PDF

42.4 KB Created: 2020-09-01 00:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f4e785c7ff80c53ec18ec90b80639b9a SHA-1: 2d693ce984803552af9866b10fc2c24dfc95c95c SHA-256: 9bcc85e823296edeccfd07da22180f1521801b436822d51807aec1791c112749
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a large link farm. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.ru/wix?keyword=subject+and+verb+agreement+rules+pdf' is a primary indicator of malicious intent, likely serving as a redirector to further malicious content. The document body, though heavily obfuscated, contains references to the URL and appears to be a lure related to 'subject and verb agreement rules'.

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.ru/wix?keyword=subject+and+verb+agreement+rules+pdf
    • https://static.usrfiles.com/ugd/19103d_a83c4c4275e2446eb6c381c5555b8cdf.pdf
    • https://static.usrfiles.com/ugd/9a242c_cb4bec13a6684368ba764b377de5c0a1.pdf
    • https://static.usrfiles.com/ugd/0c41e7_eaa9590569714afab1e690e830af1da5.pdf
    • https://static.usrfiles.com/ugd/3649d2_3c3b1cad019642ed8cebdeec9c5a5ac1.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/bizisumexu.pdf
    • https://cdn.shopify.com/s/files/1/0446/0940/5091/files/2._5_tog_sleeping_bag_baby_guide.pdf
    • https://cdn.shopify.com/s/files/1/0431/4326/6458/files/97529972088.pdf
    • https://static.usrfiles.com/ugd/b8c837_5428e0bdcff242df9558c1964139c32d.pdf
    • https://static.usrfiles.com/ugd/902d29_3c527874e8dd49ae9bb1f467091da640.pdf
    • https://static.usrfiles.com/ugd/41a0b6_bd5ece72e3244ee1a5162471bfde8bce.pdf
    • https://static.usrfiles.com/ugd/b8c837_da1b8b8407d442d7998881b1a0444216.pdf
    • https://static.usrfiles.com/ugd/e32576_ae6d1cd59ea34862bff69223318bd63d.pdf
    • https://static.usrfiles.com/ugd/ad2ade_a9607216ab8649ed9d3e989198c3bff8.pdf
    • https://static.usrfiles.com/ugd/b8c837_0dc2bb375e19499ba24623f6837afb66.pdf
    • https://static.usrfiles.com/ugd/c0fca2_c4181d4117794c0292ba998e7dc90c08.pdf
    • https://static.usrfiles.com/ugd/784815_55ad54ee6ff24f5ea427089d1576ad88.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_off0000662b.bin
d57c5b6701b7a9493ba619d5bb4c5cfe29ed6881b0700713833b2a8b5fffd527		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 5852 bytes
font_01_sfnt_off00007a0e.bin
3cda927753ccbf007f3e69cb3d8f85fefa5bfef9684df2f0ffe57bdad2271506		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A0E 9972 bytes

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