Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2ae7e6f8af2c99a…

MALICIOUS

PDF

50.5 KB Created: 2020-09-12 05:08:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 097d53d45dcf467ab2a75e87cb4c69b9 SHA-1: e66651b3e72169227e6a91d087392d9ab7c1baf1 SHA-256: b2ae7e6f8af2c99a04c070049955289f3796bea5743dff4ca8afe08944bd68c2
152 Risk Score

Malware Insights

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

The PDF file contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.me/wix?keyword=boost+up+songs+for+gym'. Additionally, another critical heuristic indicates a PDF link farm, suggesting an attempt to distribute malicious content or engage in SEO abuse. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing the malicious intent.

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.me/wix?keyword=boost+up+songs+for+gym
    • http://files.demsatuva.org/uploads/1/3/0/8/130813639/xefivar.pdf
    • http://files.officecondoskaty.com/uploads/1/3/1/3/131379832/851bc7bddb6af8.pdf
    • https://static.usrfiles.com/ugd/8b2c09_c7df809c25b148f1b41815448c59cb15.pdf
    • https://static.usrfiles.com/ugd/837d34_aa56ff12e9f748278b49e0993519737b.pdf
    • https://static.usrfiles.com/ugd/b8c837_20166433681549e3a1ae798c37568a2c.pdf
    • https://static.usrfiles.com/ugd/b8c837_012c1a48c59c4d30b027a1d7a6c9ffdf.pdf
    • https://static.usrfiles.com/ugd/f67134_33ed65c12c324ac5b7da7f33fe1dd462.pdf
    • https://static.usrfiles.com/ugd/d5d855_d628559ce4ec4bb980e9c06ede5081e2.pdf
    • https://static.usrfiles.com/ugd/30ea26_6a2fbde7735547f8920b59aba2b1f675.pdf
    • https://static.usrfiles.com/ugd/df7b34_650bd8a61be14d7d95263734c0b4c01d.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_off00008713.bin
b5e36494decc532a639339d244e73d421aa4dd02fe2aac73c7cb18ef37db4e94		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8713 5128 bytes
font_01_sfnt_off0000988a.bin
d5c3e2c02b57d1bea7050ed31294ed2ae151ca398c22c6f32f328cfe12dc4da0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x988A 10888 bytes

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