Malicious PDF — malware analysis report

Static analysis result for SHA-256 651c357ae2bce2a8…

MALICIOUS

PDF

53.0 KB Created: 2020-09-09 00:20:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3eab672f6c50af6b45d37f6dddf2e7a8 SHA-1: bc33ad74be6523c5203a491a9166fdfe4b45216d SHA-256: 651c357ae2bce2a8b993aaf3a95ce4b564a7200d110221d23e311d4776e3646b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a heuristic firing for linking to known malicious redirector infrastructure, specifically pointing to 'ttraff.club'. The document body, though heavily obfuscated, contains text related to a 'free residential lease agreement', suggesting a social engineering lure. The presence of numerous external PDF links, many of which are benign, indicates a link farm strategy, likely to improve SEO for the malicious redirector. No scripts were extracted, but the primary malicious activity observed is the redirection to a harmful URL.

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=free+residential+lease+agreement+georgia+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://static.usrfiles.com/ugd/48f461_8e1dc1effb2f4ff4b36533ed0c334050.pdf
    • https://static.usrfiles.com/ugd/bb13a2_25deb49e5b17412cb1cc055227384d5e.pdf
    • https://static.usrfiles.com/ugd/b222ea_65c699db59d14748aeaa398a8c7eba97.pdf
    • https://static.usrfiles.com/ugd/e2b09b_47c9cc7881a7429897f7a4b8d3c62845.pdf
    • https://static.usrfiles.com/ugd/b8c837_92285239dda64af3bd69be43a5aa0015.pdf
    • https://static.usrfiles.com/ugd/800b88_43dd48e1fc494174bd486d8a036699b2.pdf
    • https://static.usrfiles.com/ugd/a467d2_d1198edf2ae4474f9521dfb85ece9d7d.pdf
    • https://static.usrfiles.com/ugd/db1da1_8b6781c275d44d1aa98e9e7baaa42804.pdf
    • https://static.usrfiles.com/ugd/ac72e0_0c536bba5fb7447f90b9a37f2fe6ba04.pdf
    • https://static.usrfiles.com/ugd/d5415a_b0fa19b34e7e4a1c85d68d0c9fecfdb9.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000084d4.bin
b11415a7a45746a8b43bbe1c88efd647417dc1b38002f5b17bf0e97a79763dbc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x84D4 5104 bytes
font_01_sfnt_off00009612.bin
2d0eff86f7e2744506b07ede7a7fce430f77ee5c5e723143836a9545caafd4a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9612 10228 bytes
font_02_sfnt_off0000b903.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB903 4324 bytes

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