Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a1940d5b0fc683e…

MALICIOUS

PDF

40.8 KB Created: 2020-08-29 15:14:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2c72a6fb2874e54e7a6a3a9984b058b0 SHA-1: af8d6c5d34d24fba20453782865c5fdb84f18495 SHA-256: 3a1940d5b0fc683e8028548ef974f420db4b4e9f249d0f4ff671e08125b960b9
154 Risk Score

Malware Insights

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

The PDF file contains a significant number of embedded URLs, with one heuristic specifically identifying it as a 'PDF_SEO_LINK_FARM'. The primary malicious URL, 'https://ttraff.ru/wix?keyword=logitech+thx+z-5500+manual', is flagged as a known malicious redirector. The ML classifier also strongly indicated maliciousness. The document body appears to be largely obfuscated or corrupted, but the presence of numerous links suggests an attempt to lure users to external, potentially harmful, sites.

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=logitech+thx+z-5500+manual
    • https://cdn.shopify.com/s/files/1/0428/3128/2335/files/banjara_lambadi_songs.pdf
    • https://cdn.shopify.com/s/files/1/0427/4615/1078/files/busonid_50mcg_bula.pdf
    • https://cdn.shopify.com/s/files/1/0431/0928/6042/files/4060206985.pdf
    • https://static.usrfiles.com/ugd/ca9b0a_d1b6e432b76a43a4bd94286b1ded5c2e.pdf
    • https://static.usrfiles.com/ugd/b8c837_c7ceaabc4d1945d08c2a6225905d296a.pdf
    • https://static.usrfiles.com/ugd/b8c837_74d49489ccae40119cda99f384d04bb7.pdf
    • https://static.usrfiles.com/ugd/b8c837_aca4c2f294084a67a36027cb9138f938.pdf
    • https://static.usrfiles.com/ugd/b8c837_9436f4bf0adf43519e33418329dfb0f1.pdf
    • https://static.usrfiles.com/ugd/b8c837_54d4cf8d3a224de9b0cee851fed2f3e0.pdf
    • https://static.usrfiles.com/ugd/b8c837_bab90a2c16934972befaab0793c90418.pdf
    • https://cdn.shopify.com/s/files/1/0432/1542/1599/files/13436282741.pdf
    • https://cdn.shopify.com/s/files/1/0431/7147/9713/files/zowosulilod.pdf
    • https://cdn.shopify.com/s/files/1/0432/5572/6238/files/gunonetezuf.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_off00005f96.bin
c5bf63ce624e470d21fbcc8a24549dde8820eef0f1db1711e0fab052354d380c
pdf-font-stream PDF embedded font (sfnt) at offset 0x5F96 5296 bytes
font_01_sfnt_off0000719b.bin
9b90806f5c5de7cf0b187db61aebb66f2747596f193131f690cb8d4dccd197cd
pdf-font-stream PDF embedded font (sfnt) at offset 0x719B 10408 bytes