Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ad36c3869cec2e4…

MALICIOUS

PDF

62.6 KB Created: 2020-08-31 04:05:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7128bd38600062ab07f62da3f4740f2b SHA-1: 826bc886c254585266cac9b84d27d7296b1a11b4 SHA-256: 6ad36c3869cec2e412060f53d362796336d29451bff61f2573957188966ae773
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure, specifically 'https://ttraff.cc/wix?keyword=i+the+undersigned'. It also features a large number of embedded links, many pointing to Shopify domains, suggesting a link farm or a deceptive attempt to disguise malicious links. The document body, though heavily obfuscated, contains the same redirector URL, reinforcing its malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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=i+the+undersigned
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0433/4583/8248/files/villawood_detention_centre_visitor_booking_form.pdf
    • https://cdn.shopify.com/s/files/1/0429/1241/5911/files/nerizegigewulat.pdf
    • https://cdn.shopify.com/s/files/1/0430/8415/2986/files/87988519952.pdf
    • https://cdn.shopify.com/s/files/1/0428/7869/7631/files/ariens_snowblower_manual.pdf
    • https://static.usrfiles.com/ugd/451461_16e4102470e846b89b468212c56054f0.pdf
    • https://static.usrfiles.com/ugd/b88e3d_aa781d25258e43079077a1c2086cc5d0.pdf
    • https://cdn.shopify.com/s/files/1/0429/6428/7651/files/jozikejarepoge.pdf
    • https://cdn.shopify.com/s/files/1/0433/6418/8312/files/dobupo.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/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ffc.bin
5eb0f279cb9ff44b1a711bf76ffe352759d3435f3cfeba090735ad7805c776df		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FFC 23008 bytes
font_01_sfnt_off00009728.bin
0fe29c2c8f1555d49e05a3413b0f9cecc0a23c1ddc18a589abf3c9320d19a65c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9728 4552 bytes
font_02_sfnt_off0000a687.bin
cf72895d91ff519a5a88cea9e8f64aa9e7182475b82e006b8fc11d6faedd91a4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA687 10612 bytes
font_03_sfnt_off0000cb03.bin
4c0a3f0893f5e69c6acf0c6b7f036872587aec6188c41bdd40a009ab43c82216		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB03 16060 bytes
font_04_sfnt_off0000df94.bin
1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDF94 4324 bytes

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