Malicious PDF — malware analysis report

Static analysis result for SHA-256 84820aa1c3f23697…

MALICIOUS

PDF

46.0 KB Created: 2020-09-05 11:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0bfae275b94626d30a99ac98654e020b SHA-1: 6197acf5ac3acf8598e620f95fccfd58ada992e0 SHA-256: 84820aa1c3f23697233bfe986e465a9711d13bc1d3800caa5ca2cabc64c3a990
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a large number of embedded links, many pointing to a link farm hosted on static.usrfiles.com, and one critical link to a known malicious redirector at ttraff.club. The document body, though heavily obfuscated, contains the URL 'https://ttraff.club/wix?keyword=asembia1+user+guide', suggesting a lure to disguise malicious activity as a user guide. The ML classifier strongly supports the malicious verdict.

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.club/wix?keyword=asembia1+user+guide
    • https://static.usrfiles.com/ugd/f65175_6e09a779d11f45d2a0bbd97be2b6262d.pdf
    • https://static.usrfiles.com/ugd/b8c837_19e102540730479fa24403e4e216ae7d.pdf
    • https://static.usrfiles.com/ugd/8bc2a6_9cbe194f24c64289bc9f6937515fbac1.pdf
    • https://static.usrfiles.com/ugd/6c032c_4716933fda754e5f8b3fd0c569fd0fc4.pdf
    • https://static.usrfiles.com/ugd/7ef0dc_a02aea551c614e9abc3765c09e8a40c4.pdf
    • https://static.usrfiles.com/ugd/b8c837_7bc36a9f5104486ca7fc52d0f3f10884.pdf
    • https://static.usrfiles.com/ugd/a76634_4567c26a549a4915a38979b1e5278993.pdf
    • https://static.usrfiles.com/ugd/b52961_c2fc9933043f48f1aa118e54e60d658d.pdf
    • https://static.usrfiles.com/ugd/b916f4_f71d21f01a9c48f2a04d186679cbd0c3.pdf
    • https://static.usrfiles.com/ugd/67f5f7_85e3e500c2424c5fb18da4880c746d36.pdf
    • https://static.usrfiles.com/ugd/de60da_13233fb94a2c4b92a372571ec3e91537.pdf
    • https://static.usrfiles.com/ugd/9cfd0a_1b66724580bd4ff89d37b244b9a1f588.pdf
    • https://static.usrfiles.com/ugd/2ca09c_a2c7d01033fe449aa6f5d4f3d63a9f72.pdf
    • https://static.usrfiles.com/ugd/b58d21_8958dc6b4ee54d84bf1e526f2f96119f.pdf
    • https://static.usrfiles.com/ugd/83b1b3_2d1297e763f647da98d5090c6961570a.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_off00006959.bin
e8a9d73f615df8aa710617ba35ee3bcd9d19118dfd940fff49da7c42204398c5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6959 4880 bytes
font_01_sfnt_off000079e2.bin
0ae37fc6585ca96c1205335d5f711e5a6493b7d216e2a117a7445d6bdba36ac8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79E2 10388 bytes
font_02_sfnt_off00009d63.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D63 4324 bytes

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