Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbf4d7489989c5c…

MALICIOUS

PDF

41.2 KB Created: 2020-08-31 02:17:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c95457221d9a148f61634731e990df1f SHA-1: 4c15f9f327098074db105c2499dfe8bdefb1d86e SHA-256: bbbf4d7489989c5c45b252fe4a83534cecdaf647f10bb1635570fc26b745354a
152 Risk Score

Malware Insights

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

The PDF contains a mass external link farm, with a primary link pointing to a known malicious redirector infrastructure at 'ttraff.ru'. The document body, though heavily obfuscated, contains the same lure text and URLs. The ML classifier strongly indicated maliciousness, and the PDF structure itself was flagged for containing numerous external links, suggesting a phishing or redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=graceful+wendy+mass+free+pdf
    • https://static.usrfiles.com/ugd/6a22cb_b25345f5a2434f87a0a9b01c4fc0950b.pdf
    • https://static.usrfiles.com/ugd/432b07_5a530def3b094e2187a14abe4f1e57d1.pdf
    • https://static.usrfiles.com/ugd/585b1d_73208468abe54cb98ae049ff8e4fa2b7.pdf
    • https://cdn.shopify.com/s/files/1/0427/9923/5228/files/tagazetuwepugemo.pdf
    • https://cdn.shopify.com/s/files/1/0430/3699/9831/files/samutinivifa.pdf
    • https://cdn.shopify.com/s/files/1/0428/9419/6902/files/50670031904.pdf
    • https://static.usrfiles.com/ugd/d162e3_2f688792e13e43a98f88088fefcc38b1.pdf
    • https://static.usrfiles.com/ugd/b8c837_ba56ac88bcc741a4a8944f744bfed64b.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_off0000626b.bin
5ab54dff47d0df9816f2992fd0fe5a63813e96fbe6389bad1987d65128f0ea40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x626B 5524 bytes
font_01_sfnt_off00007539.bin
ef12044a97039b0e3e4575eb62c570b7302ec94adfd1743e62b7f7ddc64d3553		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7539 10352 bytes

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