Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6505192e8ec0a9f…

MALICIOUS

PDF

32.3 KB Created: 2020-08-30 12:04:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebc9ba99ca637f3b07eef8b12811a4ee SHA-1: 8daf8fd73ebbbd61ad2d22e2fa7e2f31faa19b89 SHA-256: a6505192e8ec0a9fb8c9d70a932c4d66edba59bbcb5e197e1f72764e529d481d
154 Risk Score

Malware Insights

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

The PDF document was flagged as malicious by a machine learning classifier and contains a critical heuristic indicating a link to known malicious redirector infrastructure. The document body and embedded links suggest a lure, possibly related to the text 'Kool and the gang too hot', directing users to a suspicious URL. The presence of numerous external PDF links, many hosted on static.usrfiles.com, further supports the malicious intent, likely as part of a link farm or redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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=kool+and+the+gang+too+hot
    • https://static.usrfiles.com/ugd/b8c837_5af70aa5c86a47dd94597060da276b02.pdf
    • https://static.usrfiles.com/ugd/b8c837_c8fc5307b7c84764b06b437b970d8ec4.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c723ba9a3f5462caa9481fd5195fafa.pdf
    • https://static.usrfiles.com/ugd/b8c837_43deaa3efff0478aaac26c00240fc6a9.pdf
    • https://static.usrfiles.com/ugd/eb6612_235708b9a03940e1a4f424a1a15a4e5c.pdf
    • https://static.usrfiles.com/ugd/b42fd6_b92dd737c9cf4054ac2fc87ddaa683ab.pdf
    • https://static.usrfiles.com/ugd/2c608b_cc37d3e212b64bff8c1fe38464d44e4e.pdf
    • https://static.usrfiles.com/ugd/b8c837_08eeb43d05254791a498f9333ada8f1e.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_off00004386.bin
c84e077747313875d38477215db8123656dad57a8cb516e835c9529693ef1db6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4386 4780 bytes
font_01_sfnt_off000053ca.bin
7fe2cc9ea1505083f83c08294d68715297f861dfdfc217c007860ab2922cb882		 pdf-font-stream PDF embedded font (sfnt) at offset 0x53CA 9732 bytes

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