Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d8d2bbf1bf41435…

MALICIOUS

PDF

41.9 KB Created: 2020-08-31 23:53:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36ed78465c379dbbad9e68d26e884057 SHA-1: a181265db32a3077c1f85dda0a7b1ee8c95eeb91 SHA-256: 1d8d2bbf1bf414356056c658ef6af3fbeeb044070506ae72da39a641982804d7
152 Risk Score

Malware Insights

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

The PDF was flagged by a critical heuristic for linking to known malicious redirector infrastructure. Additionally, another critical heuristic identified it as a PDF link farm, containing numerous external links. The ML classifier also strongly indicated maliciousness. The embedded URL 'https://ttraff.ru/wix?keyword=basic+tactics+for+listening+script+pdf' is the primary indicator of this malicious redirection.

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=basic+tactics+for+listening+script+pdf
    • https://static.usrfiles.com/ugd/9b33c5_69504262f1734d8cb0542893830c63bc.pdf
    • https://static.usrfiles.com/ugd/625844_44d76a00af8e4913a37d607628cb192f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4540e9d01474d0a9ed0c7c8b74ffe48.pdf
    • https://static.usrfiles.com/ugd/74e905_89b8c5e21cc442719bf498f9e74f2794.pdf
    • https://static.usrfiles.com/ugd/469aea_35a682ec22ad45ff83cf8f006fdba5fd.pdf
    • https://static.usrfiles.com/ugd/544c7e_0ffef99d62ac462d9f1a5968bc823a9a.pdf
    • https://static.usrfiles.com/ugd/b8c837_8986a352d3e34bfaa42be1ba92de6605.pdf
    • https://static.usrfiles.com/ugd/7e0eb0_a04c6cf43a0c44d498e058232cf1a3c8.pdf
    • https://static.usrfiles.com/ugd/b91566_2a83f9201c854471840bd0653d540e2f.pdf
    • https://cdn.shopify.com/s/files/1/0448/4435/1649/files/group_b_strep_cdc_guidelines.pdf
    • https://cdn.shopify.com/s/files/1/0435/9408/8616/files/widedenixijolugafixo.pdf
    • https://static.usrfiles.com/ugd/9c43ec_14314ec02fb145e1979edd68ba21554f.pdf
    • https://static.usrfiles.com/ugd/b8c837_b4e0da035d4f48fab93217cb11bd96d3.pdf
    • https://static.usrfiles.com/ugd/a640e9_7256b33db09548d99d70c08bd252a7bd.pdf
    • https://static.usrfiles.com/ugd/516574_98416aae455745ca8d94340afdd14f70.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_off000065a5.bin
2b95001fcbc921bf28afbdc4950312947c873f374b91818181bbb2c111d3b7b6
pdf-font-stream PDF embedded font (sfnt) at offset 0x65A5 5372 bytes
font_01_sfnt_off000077fc.bin
23f43384b367757172b585f6aeb6aa5a71942d931b74ea9ba31ba055f7a09a2f
pdf-font-stream PDF embedded font (sfnt) at offset 0x77FC 10088 bytes