Malicious PDF — malware analysis report

Static analysis result for SHA-256 36eb395a96c0c2ea…

MALICIOUS

PDF

40.0 KB Created: 2020-08-30 11:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 29441a0421e1e9870748da9b63def53a SHA-1: b71b6d0a00ce877e5776ef68691e7e342e72eee0 SHA-256: 36eb395a96c0c2ea2b4cf56fa3522f93b15b31f0f7ee663b9bf6c19bd6f13636
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to ttraff.ru. The document body, though heavily obfuscated, contains the same URL, suggesting it's the primary lure. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to static.usrfiles.com, likely for SEO manipulation or to host further malicious content. 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.ru/wix?keyword=practically+speaking+rothwell+2nd+edition+pdf+free
    • https://static.usrfiles.com/ugd/c7a620_88765b89b40e423a9193996ee0174d23.pdf
    • https://static.usrfiles.com/ugd/b8c837_af2a928ca80a46f1a13767b78b44bd9d.pdf
    • https://static.usrfiles.com/ugd/b8c837_df64c88cdec541dab3225807d4903a82.pdf
    • https://static.usrfiles.com/ugd/b98abb_ca6ebec177a0470cac9ef0ff3731ce38.pdf
    • https://static.usrfiles.com/ugd/9e53d4_1abbfac522f5435bb023b85e39e5cac0.pdf
    • https://static.usrfiles.com/ugd/3b47cb_1bcc9aedb6d545b2b9679af581ab1357.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3ac721f6209430e97512b755d429ab6.pdf
    • https://static.usrfiles.com/ugd/b8c837_fa4e1d730bb54bb183730743fb3ae968.pdf
    • https://static.usrfiles.com/ugd/5926b4_f12db5efdc30495aa3d034d3daa974d9.pdf
    • https://static.usrfiles.com/ugd/a771bd_b45bbfc91f6d44279e543a446bef78b5.pdf
    • https://static.usrfiles.com/ugd/b52961_6a332405c4b343d08571d4a95f4a5c65.pdf
    • https://static.usrfiles.com/ugd/ea78e0_69507d4edf83451ea4d296e368bc2048.pdf
    • https://static.usrfiles.com/ugd/2274a7_b57ed4fe6ae14534bb1db014e2fc422e.pdf
    • https://cdn.shopify.com/s/files/1/0468/0315/7141/files/kevubililesik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0053/6986/files/bernoulli_theorem_derivation.pdf
    • https://cdn.shopify.com/s/files/1/0460/6518/9019/files/buffalo_animal_pictures.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_off00004e5d.bin
0acad7707a8309ea5670b675a300705aa3608c9504200d51802a1ceabafa4223		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4E5D 5596 bytes
font_01_sfnt_off00006172.bin
acba3fdd73edaeba3bd18e78b8f9f79007b86f518aa3391126377b8a5b367c61		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6172 10336 bytes
font_02_sfnt_off00008482.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8482 4324 bytes

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