Malicious PDF — malware analysis report

Static analysis result for SHA-256 f14a8ebb6fcb6729…

MALICIOUS

PDF

40.8 KB Created: 2020-09-04 17:16:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: be809e6f28885c5925a3d6bb09e4a70e SHA-1: 28fac89b0ef6cd7d1a905151fb42383884423fa8 SHA-256: f14a8ebb6fcb67291d697b84cf66b55ddb5b1e116da8f99eb913585f60944e58
150 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as a game guide, which is a common lure. The document also features a link farm of numerous PDFs hosted on Shopify and static.usrfiles.com, likely to improve search engine ranking and mask malicious activity. The ML classifier strongly indicated maliciousness, and the PDF_MALICIOUS_REDIRECTOR_LINK heuristic confirms the presence of a known malicious URL.

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.club/wix?keyword=poe+incursion+league+guide
    • https://cdn.shopify.com/s/files/1/0432/1217/7572/files/transpose_matrix_in_r.pdf
    • https://cdn.shopify.com/s/files/1/0434/8801/8598/files/football_manager_2015_graphics.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/muvimaparareges.pdf
    • https://static.usrfiles.com/ugd/b8c837_5dcae4164ff048098c3bca6deaa0c01d.pdf
    • https://static.usrfiles.com/ugd/d4a9d6_b5ab19401d344affbcc06b9454fddd5b.pdf
    • https://static.usrfiles.com/ugd/b8c837_3923e0aa6ad9414091d289212e171a52.pdf
    • https://static.usrfiles.com/ugd/64e449_038cd784450a4144b5c59e2399295664.pdf
    • https://static.usrfiles.com/ugd/a2e20a_9227f4084d67441ea70592238293ac12.pdf
    • https://static.usrfiles.com/ugd/f65175_56e4fc12c99346bb80df7e30b3b13b77.pdf
    • https://static.usrfiles.com/ugd/b50c55_1f544eadbc7345a3bc54ce101337a1ea.pdf
    • https://static.usrfiles.com/ugd/aec2ea_c9ff910599ff4ca1821703e961b45846.pdf
    • https://static.usrfiles.com/ugd/f3cb45_d870e89270224a3a816bf483cf5b26df.pdf
    • https://static.usrfiles.com/ugd/9d66c7_23aba948726f4f04b98fe29532d75a1e.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_off0000624b.bin
04142f3cb4cfdeaa5bf1fdb5106ef22a2546673669bce1cdb8c7766a09cee4cf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x624B 5108 bytes
font_01_sfnt_off000073b6.bin
8dee2ea261f515f83789c981a68161b35506313d980067abd86e2ed43f05ac13		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73B6 10176 bytes

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