Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0732dfb7d4ef6ac…

MALICIOUS

PDF

46.2 KB Created: 2020-08-30 19:28:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0725cc13593c38f34ff0a0706d679781 SHA-1: 20b2a29ad38a32a95eaaac615d781bdd5ff6627a SHA-256: f0732dfb7d4ef6ac62c45040e950406563ccf3af8cfd1dd4327a920fc2668ad0
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The embedded URL points to a known malicious redirector, and the document body, though heavily obfuscated, contains references to this URL. The ML classifier also strongly indicated maliciousness. The primary attack pattern involves luring users to external sites through a dense network of links.

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=esl+pre-intermediate+reading+texts
    • https://static.usrfiles.com/ugd/9f6a24_498e349b3f844018830967d02e9f8955.pdf
    • https://static.usrfiles.com/ugd/b8c837_dad603711759498baecad27aba6bcb64.pdf
    • https://static.usrfiles.com/ugd/cc14e4_3a993abba376411f80f067f31d400877.pdf
    • https://static.usrfiles.com/ugd/2e79a6_34100381ec0040b78e501108cfd07f5e.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/articles_on_mergers_and_acquisitions_in_banking_sector.pdf
    • https://cdn.shopify.com/s/files/1/0432/8249/7700/files/victoria_2_research_guide.pdf
    • https://cdn.shopify.com/s/files/1/0464/9543/2872/files/worksheets_colours_esl_students.pdf
    • https://static.usrfiles.com/ugd/b0b521_aefee29585754ddba96a2000d108cf63.pdf
    • https://static.usrfiles.com/ugd/b8c837_e97a4c2bb7ae48c3aba4fe4fdf46d109.pdf
    • https://static.usrfiles.com/ugd/b8c837_4f9a8776b2b6404994a48ea1ae0a31d8.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000536b.bin
43da0b4a1dccd55c40646273b6aead5d9ae1e32ff9881d36b590af855c15bc5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x536B 5012 bytes
font_01_sfnt_off0000645e.bin
8b44a3dcb3e108236371f5dfbc572b80abc5f1ac1c8d127725bec8af39a8fecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x645E 10600 bytes
font_02_sfnt_off000088d1.bin
39b2f4b99ee08965fd4836f89f628a00cde8346cb181131bba0308e80db8fb67		 pdf-font-stream PDF embedded font (sfnt) at offset 0x88D1 16092 bytes
font_03_sfnt_off00009d98.bin
b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D98 4324 bytes

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