Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3110b237fafdb94…

MALICIOUS

PDF

40.0 KB Created: 2020-08-29 14:59:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a5a6468a3ab16d3e3f2c5ff33719f0fb SHA-1: 6d37b6261ae6a9b05d86927c80bb8a83bf64d4ec SHA-256: c3110b237fafdb9456149ba4aa227bd71b5d03d5f0646444fc59660e17a7cedf
150 Risk Score

Malware Insights

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

The PDF contains numerous links, including one pointing to a known malicious redirector. The document body, though partially corrupted, includes text related to 'reading comprehension' and the malicious URL, suggesting a lure. The presence of a PDF_MALICIOUS_REDIRECTOR_LINK heuristic firing strongly indicates the intent to redirect users to a harmful site. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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.ru/wix?keyword=reading+comprehension+passages+intermediate+level
    • https://static.usrfiles.com/ugd/b8c837_3a5d1e81f406449aa9cbf9595a2968db.pdf
    • https://static.usrfiles.com/ugd/b8c837_195e06c7da894170a91d6081932901e9.pdf
    • https://static.usrfiles.com/ugd/b8c837_22b63078c113456380a9961e3a46eb28.pdf
    • https://static.usrfiles.com/ugd/b8c837_a9cc06c6fb374e959498cb5485af8591.pdf
    • https://cdn.shopify.com/s/files/1/0434/4473/2065/files/111357468.pdf
    • https://cdn.shopify.com/s/files/1/0430/6105/1546/files/60324081452.pdf
    • https://static.usrfiles.com/ugd/b8c837_d29c27e147c94f83a57bab91cceceba3.pdf
    • https://static.usrfiles.com/ugd/b8c837_00746bb3e7cd49f19d7059be2d01271d.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c83d6f5ee0a4f86b957aad8ec816b6c.pdf
    • https://static.usrfiles.com/ugd/90423f_d4b032510e66407790ee288c12c8ef00.pdf
    • https://static.usrfiles.com/ugd/b8c837_23fc044e841f4bfab69e807a1402186d.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_off00004ff4.bin
208f438f41e715b058d91fc7a56f3e77bd1d79beb738b30cce101eb85a50013f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4FF4 5340 bytes
font_01_sfnt_off000061ee.bin
355bc90e32b4483933c5427810c0476a51a752ec2dc40ff35857e1487c818011		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61EE 10316 bytes
font_02_sfnt_off00008513.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8513 4324 bytes

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