Malicious PDF — malware analysis report

Static analysis result for SHA-256 f46d4e12f57bf31f…

MALICIOUS

PDF

46.3 KB Created: 2020-09-02 21:35:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cf00a1dad4b0d996b5a5e5ce507ebfca SHA-1: 0b0ba1fd5cd3ee6d47d5e4323fa61a67f2a015a6 SHA-256: f46d4e12f57bf31fce015a6d592e2fb91643a70c139cfa88ab1bf9ff347c4420
152 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and heuristics indicate it contains a large number of external links, with at least one pointing to a known malicious redirector. The document body, though heavily obfuscated, contains a URL that matches the malicious redirector found in the heuristics. This suggests the primary purpose is to lure users to malicious 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.club/pify?keyword=cars+2+gameplay
    • https://static.usrfiles.com/ugd/ff3115_930d5cb639004efcad471da2a715c625.pdf
    • https://static.usrfiles.com/ugd/b6edda_49b54ea964c04ca48a30933aa0872463.pdf
    • https://static.usrfiles.com/ugd/6f9b04_71751c8237194828aca3d22e67711d4f.pdf
    • https://static.usrfiles.com/ugd/2f8cea_299a180eb9684c3db4b5fa8a95ef27b6.pdf
    • https://static.usrfiles.com/ugd/6cf392_e17761f2afe5413a820c3f84e8e858c0.pdf
    • https://static.usrfiles.com/ugd/3b0c81_a5311a7fc492465fa495e54632619808.pdf
    • https://static.usrfiles.com/ugd/ff2e72_76d719393bd447adb74847248d01e824.pdf
    • https://static.usrfiles.com/ugd/4f270c_8e60dd3359c342c39c3a37dbcd70821e.pdf
    • https://static.usrfiles.com/ugd/b8c837_898e8e7762264120a1679a80c3bdadeb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c91a8d6cd1764ee89fb98ba89efd4be0.pdf
    • https://static.usrfiles.com/ugd/4dd980_0a2b7dd8fb9c403ab9e3eebe4d629eda.pdf
    • https://static.usrfiles.com/ugd/b8c837_f3b7e6ba1dcd4a3a8e9da07b81913988.pdf
    • https://static.usrfiles.com/ugd/6cfc61_919e374211464647bbf34c8aa8333323.pdf
    • https://static.usrfiles.com/ugd/6cfc61_4a217a4e81ac4b37905ef5d25059f7d9.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_off00007773.bin
8ae66c77a58e7e559d1b43c49331b205264735cbf34cb8aaf5e1e1169cc40b99
pdf-font-stream PDF embedded font (sfnt) at offset 0x7773 5280 bytes
font_01_sfnt_off00008956.bin
1a5a89755f3cf7e099569b3f4ff04f93dda1cdfa9c722c92b0e8d8bf972eab6f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8956 10196 bytes