Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d6a3377604d239e…

MALICIOUS

PDF

39.3 KB Created: 2020-08-31 11:49:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27437306059ba8e7da23928663a9b36b SHA-1: 364dbe173ceeaa96174688aef3bb843414787363 SHA-256: 3d6a3377604d239efda3086df425a5cbdf3b1fca795cfd106e880094456a3541
154 Risk Score

Malware Insights

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

The PDF contains a link farm designed to appear as software licensing information, specifically mentioning 'Adobe Photoshop Extended CS6 serial'. The primary malicious URL, https://ttraff.link/wix?keyword=adobe+photoshop+extended+cs6+serial, is flagged as a malicious redirector. The document body, though heavily obfuscated, contains references to this URL and other benign-looking PDF links, suggesting a lure to drive traffic to the malicious redirector. The ML classifier strongly supports the malicious verdict.

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=adobe+photoshop+extended+cs6+serial
    • https://static.usrfiles.com/ugd/37321e_6e6e1b472a614f9db346bd27bb8bcf58.pdf
    • https://static.usrfiles.com/ugd/f96b02_33581ad699c2400faafcc588c2f6a21a.pdf
    • https://static.usrfiles.com/ugd/d1c05f_289775cdc0c34880aae54f2d584a8c76.pdf
    • https://static.usrfiles.com/ugd/b8c837_cd0016e242474b5ea7b087894e8400e8.pdf
    • https://static.usrfiles.com/ugd/ae15ca_822367d1d97f4c0f92e986418d04bdb4.pdf
    • https://cdn.shopify.com/s/files/1/0432/8888/7460/files/78436637573.pdf
    • https://cdn.shopify.com/s/files/1/0430/7664/9121/files/sotitinoxaxanudopojap.pdf
    • https://cdn.shopify.com/s/files/1/0437/5396/3678/files/chemistry_form_2_structure_and_bonding.pdf
    • https://cdn.shopify.com/s/files/1/0438/8909/8907/files/1332749620.pdf
    • https://cdn.shopify.com/s/files/1/0431/9405/6861/files/riwus.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_off000052e8.bin
4da9b0aed5619ddfd659ad6d5b7bb2590e9c5f698c3204820a1b4d049d1e6904		 pdf-font-stream PDF embedded font (sfnt) at offset 0x52E8 5512 bytes
font_01_sfnt_off00006596.bin
7c44149a1385d5549cf95696e4ef2761c221c8b134fc8202d195dccce2cdf7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6596 13788 bytes

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