Malicious PDF — malware analysis report

Static analysis result for SHA-256 545879a1ccb608fd…

MALICIOUS

PDF

52.2 KB Created: 2020-08-31 15:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f93f74b20157b7919a6e42bc852b3f3c SHA-1: 68d0744aa9bddc384defdb7f1c73025ccc9270e6 SHA-256: 545879a1ccb608fd91ef66e943bd31bc457350505b129bad6f482f722ec5182a
152 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by an ML classifier and contains numerous embedded links. One critical heuristic identified a link to known malicious redirector infrastructure at 'https://ttraff.ru/wix?keyword=rational+inequalities+examples+and+answers'. Another heuristic indicates a PDF link farm, with many links pointing to 'static.usrfiles.com'. The document body, though heavily obfuscated, contains the same URL as the redirector link, suggesting a lure to disguise the malicious intent. The primary attack pattern involves redirecting users to 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=rational+inequalities+examples+and+answers
    • https://static.usrfiles.com/ugd/fbccce_2ce1f74792164c4fad57885b0e5e663d.pdf
    • https://static.usrfiles.com/ugd/7f929b_29fa9e881e7149ecae74875cb94e7e9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8af242500e944e1386a1ccb6cee31993.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8a3b5f26b1c43e3b0c78f03e4a0e224.pdf
    • https://static.usrfiles.com/ugd/469aea_9d75f405914d4cb0b3b91ea7e966bacb.pdf
    • https://static.usrfiles.com/ugd/b8c837_14e3c7e9331d406da9326c96fd478f5d.pdf
    • https://static.usrfiles.com/ugd/5ecadc_6569e6ed6e224b6886dd205eec34e087.pdf
    • https://static.usrfiles.com/ugd/8b9728_074652da44294dd4a647bd9582d8c90e.pdf
    • https://static.usrfiles.com/ugd/b8c837_59eba415dd24402eadfa50bc7d0585f8.pdf
    • https://static.usrfiles.com/ugd/fa6f14_c56566b1af0d46c08601f58bbac12b7d.pdf
    • https://static.usrfiles.com/ugd/eaf48f_9390385813f248b8a7cd567696d2ddd9.pdf
    • https://static.usrfiles.com/ugd/b8c837_85e335e89242484e805564d06a3c0338.pdf
    • https://static.usrfiles.com/ugd/912de2_aef928ddd41c4a9284f9c50f43a14ca3.pdf
    • https://cdn.shopify.com/s/files/1/0432/1860/0104/files/dururuzebame.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/temekefi.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006ff9.bin
2e89b00299bebc915ee0d611d5c4707378a2db1b3555d8043252e90250189a8f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FF9 5400 bytes
font_01_sfnt_off00008258.bin
734204b63817c54fe00451d39e930dc85cd0824883100592fface02352afec6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8258 13904 bytes
font_02_sfnt_off0000ae06.bin
bbb4928b2c5a50c0832ecd6ebb1362cd2d714bbe3e9ddae61164af3ebb87f482		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAE06 16112 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.