Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9b3824223b42d57…

MALICIOUS

PDF

41.0 KB Created: 2020-08-30 17:40:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc3e5169ee6301fdc2ccf34ea0db7db9 SHA-1: e0da520875a15ab1b08a72492ddb6a27328669e8 SHA-256: a9b3824223b42d57679c9fae4519b0e6ab349e3bfefc91b79ae73e1e79373299
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.001 Malicious Link T1059.001 PowerShell

The PDF contains a critical heuristic firing for a malicious redirector link, specifically `https://ttraff.cc/wix?keyword=asus+x401u+drivers+windows+7`. This link is presented within the document body, disguised as a driver download for 'Asus x401u drivers windows 7'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on `cdn.shopify.com` and `static.usrfiles.com`. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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.cc/wix?keyword=asus+x401u+drivers+windows+7
    • https://cdn.shopify.com/s/files/1/0440/1024/2198/files/bekhayali_full_screen_whatsapp_status.pdf
    • https://cdn.shopify.com/s/files/1/0438/1681/2706/files/bedebamejejotaf.pdf
    • https://cdn.shopify.com/s/files/1/0431/0990/8637/files/assignment_first_page.pdf
    • https://static.usrfiles.com/ugd/a58b01_1734669d1d9a4db888de90f82243ed48.pdf
    • https://static.usrfiles.com/ugd/b52961_b8c7c9dd8b4e4dc8a62d36243785caa3.pdf
    • https://static.usrfiles.com/ugd/856cea_6207893eaa4b4a29997e769f3fda39ca.pdf
    • https://cdn.shopify.com/s/files/1/0432/0873/6927/files/87524331634.pdf
    • https://cdn.shopify.com/s/files/1/0430/2969/2577/files/delurugebiritezis.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_off00005573.bin
07285384ee0de64fd02e1120265411b9f389bc81dd614ff3dc433f88fc8d8180		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5573 5148 bytes
font_01_sfnt_off00006735.bin
407bf54cad20c3cadca39dea43bb0fea0779a8b2f0e50f69f1d1ec6518043862		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6735 14888 bytes

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