Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f8ce1cbba369b27…

MALICIOUS

PDF

44.8 KB Created: 2020-09-02 08:48:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2726d778f1cb0a2073294aae05f07654 SHA-1: cefc604eb179f9cf44df9c45dc3f54815ab8a9c3 SHA-256: 4f8ce1cbba369b27b19d557abf4713bc20597149dabc9d386e38b03eb6d1c2c0
154 Risk Score

Malware Insights

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

The PDF document was flagged for containing a malicious redirector link and a link farm. The primary malicious URL, https://ttraff.ru/wix?keyword=classified+advertisement+format+cbse+class+12, is likely used to direct users to a malicious site. The presence of numerous links to static.usrfiles.com suggests an attempt to manipulate search engine results or distribute further malicious content. No scripts were extracted, and the document body was heavily obfuscated, but the heuristic firings strongly indicate a malicious redirection scheme.

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.ru/wix?keyword=classified+advertisement+format+cbse+class+12
    • https://static.usrfiles.com/ugd/80c1db_ab45fe2ce6014cb7bc5fd992625542b0.pdf
    • https://static.usrfiles.com/ugd/b28561_07bb4116fa1d41d3846bc36058c74544.pdf
    • https://static.usrfiles.com/ugd/a91264_8f241888dca3485cadccba28aea9794c.pdf
    • https://static.usrfiles.com/ugd/b8c837_fdd3d76c3f8547e69e103a70e265f844.pdf
    • https://static.usrfiles.com/ugd/12dc78_2b953e2b3a4346ab9f18cf283aa0f974.pdf
    • https://static.usrfiles.com/ugd/b8c837_f60e6bf37bba49bab33a35556f3a8162.pdf
    • https://static.usrfiles.com/ugd/a467d2_cdfc8c3848bc4fda8be2d06067f487fe.pdf
    • https://static.usrfiles.com/ugd/565485_683a8bba0da34e4c8b30f943183dee86.pdf
    • https://static.usrfiles.com/ugd/b8c837_57ede5627bd64971b4976289694babe6.pdf
    • https://static.usrfiles.com/ugd/5cd33b_5ff44114125e4fe3a57f2bb7646e8523.pdf
    • https://static.usrfiles.com/ugd/b8c837_5be4f193f219455d8047db8ff99135ce.pdf
    • https://static.usrfiles.com/ugd/a18aa6_0bad2f79dc9147e5bf7ee59d1ebdac37.pdf
    • https://static.usrfiles.com/ugd/10e3af_3dd2f7ae857b46a5b83e8c4daed65caa.pdf
    • https://static.usrfiles.com/ugd/95089d_6e0a3a8c2dfb41188f0f620a6923ea5f.pdf
    • https://static.usrfiles.com/ugd/b8c837_ceab100c7ad044f2b9bdfc36ff82f750.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_off000062f6.bin
267fe73231011b91de614615b62a1bf8e2b5a2c70981c4f0250d0b16e8b6cbea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62F6 5364 bytes
font_01_sfnt_off00007520.bin
3f43566652f984a3c164aa2f335dbf757ee3c5c0c21d0835d73f71106f102f82		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7520 10248 bytes
font_02_sfnt_off00009800.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9800 4324 bytes

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