Malicious PDF — malware analysis report

Static analysis result for SHA-256 32b2ec9bf5b1b19e…

MALICIOUS

PDF

35.1 KB Created: 2020-08-29 03:12:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 023c3a67166f65e55e1806e2ea6a2cee SHA-1: 1235b950bdc14a94a8defd3287219a62744a5dec SHA-256: 32b2ec9bf5b1b19ea3566182db60c1053d4c78cf214c50160a0ccb502a2c4131
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, specifically pointing to 'ttraff.cc'. This URL is embedded within the document, likely intended to trick the user into clicking it. The document also contains a large number of external PDF links, many hosted on 'static.usrfiles.com', suggesting a link farm or SEO poisoning tactic to distribute the malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.cc/wix?keyword=bunn+vpr+commercial+coffee+maker+man
    • https://static.usrfiles.com/ugd/b8c837_01a89b886dc64d71812895460bb1719c.pdf
    • https://static.usrfiles.com/ugd/b8c837_7153104b2f4e4ed4bfcd29b37267f57e.pdf
    • https://static.usrfiles.com/ugd/b8c837_4700affa9b294b6ab96056e667ff6845.pdf
    • https://static.usrfiles.com/ugd/b8c837_ffb0913aa46a462cb8449f0b54379c77.pdf
    • https://static.usrfiles.com/ugd/b8c837_3192a14a0fbe4f5593de9274581fa9d7.pdf
    • https://static.usrfiles.com/ugd/b8c837_ee156484cb8940ff8acfb0f0c7cf1a97.pdf
    • https://static.usrfiles.com/ugd/b8c837_d04ec466c58b4e1fa7f83985518c6511.pdf
    • https://static.usrfiles.com/ugd/b8c837_789b67d666bf4959a7013fb3584f0a42.pdf
    • https://cdn.shopify.com/s/files/1/0434/3015/0300/files/37605717465.pdf
    • https://cdn.shopify.com/s/files/1/0429/7578/9215/files/agni_natchathiram_audio_songs.pdf
    • https://cdn.shopify.com/s/files/1/0431/4179/1895/files/21019750391.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_off00004a9f.bin
81d8e980dd184833ace805a8d3a0c337eaea0a8db8a5c5186f2ddf77b2e8a5e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4A9F 5156 bytes
font_01_sfnt_off00005c15.bin
6e6056517c823516fa890d41cb493b18828d9c7dbef5440079a6a0cf6de5d471		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C15 10396 bytes

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