Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9cd6f8944a781dc…

MALICIOUS

PDF

45.8 KB Created: 2020-09-02 03:37:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1de4d033ce00a9384f2fb03bfe880369 SHA-1: f79f05c50992c3bbe0dff84ad204a3f57f8b067f SHA-256: b9cd6f8944a781dc8a957529b9bbb3b9222bad9e50f621ee96dfdd22d24a41d1
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a game download, which is a common social engineering tactic. The ML classifier strongly supports the malicious nature of this PDF. The document body, though heavily obfuscated, contains the URL that is also flagged by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic.

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.link/wix?keyword=angry+birds+golden+eggs+game+free
    • https://static.usrfiles.com/ugd/9ea91e_5cfce50e60f240749a5d8dc96c3288ce.pdf
    • https://static.usrfiles.com/ugd/d902bb_69cf6b1d7ab54eec9e9ca031a77280ce.pdf
    • https://static.usrfiles.com/ugd/bb13a2_0e3dd70777474d519b506af81565b5f7.pdf
    • https://static.usrfiles.com/ugd/ae059d_a86686b885cd4e59a8aaaf003e88d5b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_cdfc22dafde64875ada98deafc55b3ca.pdf
    • https://static.usrfiles.com/ugd/2f7815_abb34d371dc54c74bd96723830adf73b.pdf
    • https://static.usrfiles.com/ugd/4479ed_2997960ae8f24f9f8e7082472b0746ea.pdf
    • https://static.usrfiles.com/ugd/63022f_7676651a24c8458d9f5839a8504d3ed7.pdf
    • https://static.usrfiles.com/ugd/4c1554_40f814ca379f4346acb8d2b4fbd62280.pdf
    • https://static.usrfiles.com/ugd/1df9ea_096b62aba2b04027a9f0f21c70b2fcec.pdf
    • https://static.usrfiles.com/ugd/3f0e57_91ad3b5104b5449bb78a12bc8f6565d1.pdf
    • https://static.usrfiles.com/ugd/2c608b_f2a176dbe2fe4fa8b059e3dda137d773.pdf
    • https://static.usrfiles.com/ugd/ab059d_52597c99db694f7cb0bee0572ddae4b7.pdf
    • https://static.usrfiles.com/ugd/b8c837_d20b110532c74c6eb7e66faf85c44d35.pdf
    • https://static.usrfiles.com/ugd/5be868_6a9df1ebb62c4b95be5da4aa8ef2d5a5.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_off00006788.bin
1244775771482f510c13adb641bda6fbc162dd420f57d224c846be4bd159672e
pdf-font-stream PDF embedded font (sfnt) at offset 0x6788 5164 bytes
font_01_sfnt_off000078f6.bin
f09235b8b01d7da62444a8d53829fd808d2acebb84d276c74267b4798c92de4e
pdf-font-stream PDF embedded font (sfnt) at offset 0x78F6 10364 bytes
font_02_sfnt_off00009c79.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3
pdf-font-stream PDF embedded font (sfnt) at offset 0x9C79 4324 bytes