Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf501c560cae18fc…

MALICIOUS

PDF

41.7 KB Created: 2020-08-31 11:33:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 296a60d85b65e9618872412aab5460be SHA-1: 2a5c5d42944954373f55bfe07ea5fdcf2aeba388 SHA-256: cf501c560cae18fcfecd32d36963ff48a79dd50b94abfd1327afc73c6440b3fc
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to 'https://ttraff.ru/wix?keyword=igloo+chest+freezer+manual'. This URL is embedded within the document body, disguised as a manual for an Igloo chest freezer, suggesting a social engineering lure. The PDF also exhibits characteristics of a link farm, with numerous external links, and is flagged by an ML classifier as malicious. No scripts were extracted, but the primary attack vector appears to be a drive-by download or redirection to a malicious site.

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=igloo+chest+freezer+manual
    • https://static.usrfiles.com/ugd/1df9ea_bdfe7a0dcb5a45b587b387116a839216.pdf
    • https://static.usrfiles.com/ugd/b8c837_e32663d164b94940a19c6eeb3fa24506.pdf
    • https://static.usrfiles.com/ugd/a86d68_d13f1c4f9df44f5aab7343b675a355ef.pdf
    • https://static.usrfiles.com/ugd/db93e9_44af3e4306714d508e48d8cd2d98f94d.pdf
    • https://cdn.shopify.com/s/files/1/0429/7015/3113/files/totogujuwirenawuwuwujo.pdf
    • https://static.usrfiles.com/ugd/b13fd1_e1c0c641ebf646f4b42f4e20c633c3c5.pdf
    • https://static.usrfiles.com/ugd/b8c837_3f3e3cad37c74af9a38918bbef1032de.pdf
    • https://static.usrfiles.com/ugd/80bfa9_79e32402f99c48518f138d44e91b07fc.pdf
    • https://static.usrfiles.com/ugd/e78b77_7275ae528d6f4b619233842185444e7f.pdf
    • https://static.usrfiles.com/ugd/b8c837_a06eea6c7f914cccb98efea958a5012a.pdf
    • https://static.usrfiles.com/ugd/f14cf6_9d1ea0d567da49b1ae0acf05d824d055.pdf
    • https://static.usrfiles.com/ugd/b8c837_4b2644d78f39464fa3d97d8f0891de10.pdf
    • https://static.usrfiles.com/ugd/b8c837_4505f707abef4a2eba8713b00a831b7b.pdf
    • https://static.usrfiles.com/ugd/1a89c8_4216f62263604a918256b8efbe92082f.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_off0000582b.bin
0349b0b56f96930d4fe476e01d1e3b5e0175c1a10a800d208f85d665bec843dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x582B 3400 bytes
font_01_sfnt_off0000644a.bin
0d9b36f776356cfffe722f09524c05fdbcdfc42aa0227da3d26f366f8537de86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x644A 5284 bytes
font_02_sfnt_off0000761e.bin
46a161500f25950389441c88e3d1c63204587b88c1402cae513b1d7d1e121355		 pdf-font-stream PDF embedded font (sfnt) at offset 0x761E 10392 bytes

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