Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b59b94c742702cc…

MALICIOUS

PDF

53.4 KB Created: 2020-09-02 12:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e4e690d9582c0a2e1a53ab8864436a2e SHA-1: 529cc525e8f9852378e4d855388a86668a8e1304 SHA-256: 3b59b94c742702ccdd76c029d8eb7a4c99e87599f5102e031944ee7dd1cbc88a
154 Risk Score

Malware Insights

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

The PDF file was flagged as malicious due to a high number of embedded links pointing to a redirector. The primary malicious URL identified is https://ttraff.ru/wix?keyword=b.+o.+c+songs, which is part of a link farm. The document body, though heavily obfuscated, also contains this URL, suggesting an attempt to lure users to malicious content. The ML classifier strongly supports the malicious verdict.

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=b.+o.+c+songs
    • https://static.usrfiles.com/ugd/a86d68_2536a142c3414182843e25b9494ecb70.pdf
    • https://static.usrfiles.com/ugd/c8d394_3ff6ca2abb1a433e98fa061655cff9b6.pdf
    • https://static.usrfiles.com/ugd/b8c837_eba7bf65c2c84f02a6739c84ebca9f86.pdf
    • https://static.usrfiles.com/ugd/ab63e3_82d6c387771c4a9fa7883b034f109d07.pdf
    • https://static.usrfiles.com/ugd/b8c837_442329143f1244b99b68507da90d1fdc.pdf
    • https://static.usrfiles.com/ugd/5e81b9_3e6a46762e2243f9af8da5327ae47c6c.pdf
    • https://static.usrfiles.com/ugd/cb2bed_787a1cb8e3b643d49efe72d3d583ddd9.pdf
    • https://static.usrfiles.com/ugd/7ea8bb_58caaaec99804492b8153230bd2c4d42.pdf
    • https://static.usrfiles.com/ugd/b8c837_cc5b990f1f2f41de825396a208c22ef8.pdf
    • https://cdn.shopify.com/s/files/1/0433/4298/7422/files/871330463.pdf
    • https://cdn.shopify.com/s/files/1/0438/8497/0152/files/kifirefumek.pdf
    • https://cdn.shopify.com/s/files/1/0431/9127/1586/files/jisemedajotidobe.pdf
    • https://cdn.shopify.com/s/files/1/0433/6982/4414/files/sazirokeketoxuwizew.pdf
    • https://cdn.shopify.com/s/files/1/0464/9756/2776/files/forever_armon_and_trey_free.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000596e.bin
fe43044f8903f32097cfa3fb32beb20bbdbbf3dc6864a49e96b97b9f440e24e9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x596E 4252 bytes
font_01_sfnt_off000067d0.bin
c9939c520006a98bc055b8bb1afcf6a83fb3b60b32dfff4345ad2c2758f079c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67D0 16752 bytes
font_02_sfnt_off00009bc5.bin
1df41416ece054d3cca32f135e48dc95f4d9c8a2bff4ba4edba1d14e21aabef6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BC5 18776 bytes
font_03_sfnt_off0000b92c.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB92C 4324 bytes

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