Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3adca8d57d31be9…

MALICIOUS

PDF

42.8 KB Created: 2020-09-01 00:06:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 234457d5b4d8d57b050660f639034c8a SHA-1: aef4fbf65dca9eca0a9d16e400820787eea2b54f SHA-256: f3adca8d57d31be9e40e8fef6d2943d6a64e0dbe0b8c8e16c4d0dad2693a2cdc
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.ru, which is disguised with a keyword related to 'Android tv app keyboard'. The document also hosts a large number of other PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier strongly indicated maliciousness. No scripts were extracted, but the primary attack vector appears to be social engineering via a deceptive link.

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=android+tv+app+keyboard
    • https://static.usrfiles.com/ugd/10b11f_66783c4af8e649bbba7b2dec68e4511d.pdf
    • https://static.usrfiles.com/ugd/b5472a_8d637221f5df485a8454423ddf658a28.pdf
    • https://static.usrfiles.com/ugd/b916f4_29e41b48fc6d4be484782ff4a8fa93da.pdf
    • https://static.usrfiles.com/ugd/dc8a8e_b029ee913cb94595a2277eab49ad043a.pdf
    • https://static.usrfiles.com/ugd/e78b77_95a8bac07f7849c3907bd8484d9c6a34.pdf
    • https://static.usrfiles.com/ugd/625844_0abc48b49d6f4821870c44e8498e0b19.pdf
    • https://static.usrfiles.com/ugd/b50c55_675726ea93724838b11ea653b82d4070.pdf
    • https://static.usrfiles.com/ugd/e5a943_fe452d939bf644b4aacf53e4a6b4e0db.pdf
    • https://static.usrfiles.com/ugd/a382ee_1c0704fc2b544175b12bc167fd89294b.pdf
    • https://static.usrfiles.com/ugd/f84671_5c49e1fd46bc473e8cba9bb43d307d56.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_off00006a48.bin
aecef0a7dddeb10cff02702fb84215289ddb1a1ace8d3cb648691c6ecece9bcb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A48 5100 bytes
font_01_sfnt_off00007bbb.bin
ac5b2b0eeb84fe9998f62bb6e7b0ba440c34b0e3253365f9106343ed9b932f11		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBB 10260 bytes

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