Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2623fed339a00f…

MALICIOUS

PDF

42.2 KB Created: 2020-08-30 03:52:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8188356bd7608aaead84b1b56c3d940 SHA-1: 19942e6306ff4628c2048a4a0d7fc31ed07e3825 SHA-256: db2623fed339a00f341871c40ba74028b000b6b30694af122f89de34383e7cf7
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, pointing to 'https://ttraff.ru/wix?keyword=centerpoint+sniper+elite+370+scope+m'. This URL is presented within the document body, disguised as a search result for a scope. The PDF also exhibits characteristics of a link farm, with numerous external links, many hosted on static.usrfiles.com. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=centerpoint+sniper+elite+370+scope+m
    • https://cdn.shopify.com/s/files/1/0431/0309/2898/files/66068726294.pdf
    • https://cdn.shopify.com/s/files/1/0433/1087/4777/files/allcast_premium_apk_xda.pdf
    • https://cdn.shopify.com/s/files/1/0447/4670/2999/files/general_awareness_aptitude_questions_answers.pdf
    • https://cdn.shopify.com/s/files/1/0438/6376/9243/files/daxewejigojimikogefulukox.pdf
    • https://cdn.shopify.com/s/files/1/0435/5771/6119/files/social_arithmetic_mathematics.pdf
    • https://static.usrfiles.com/ugd/b8c837_b3fd92bbe90345d5827dee7359051f6f.pdf
    • https://static.usrfiles.com/ugd/9757e7_2b1fe4cd75774bb7882e986bd00c802b.pdf
    • https://static.usrfiles.com/ugd/b8c837_4a4f14071a4c426f88c4eb5238b1e70f.pdf
    • https://static.usrfiles.com/ugd/aef5b7_f4972c63cfde4566a068f3bfb485c230.pdf
    • https://static.usrfiles.com/ugd/b8c837_23b49f4d1d194ea6ab94de09e6916209.pdf
    • https://static.usrfiles.com/ugd/b8c837_583313f13a004833a69252c5310ad09f.pdf
    • https://static.usrfiles.com/ugd/b8c837_68deb2993345474ea8b91d98a72facf5.pdf
    • https://static.usrfiles.com/ugd/76156b_2991ac18f3274fbbbe1dfb0aed4ef20e.pdf
    • https://static.usrfiles.com/ugd/b8c837_032545bc579f4844a2adcab88841ae67.pdf
    • https://static.usrfiles.com/ugd/b8c837_20c74f2cbcf343fa86598e2745b36408.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_off0000660b.bin
9c66d3924992614d67aa8c8c0e014eb32dea9cdc2241dea8dc75b0f3a5c6c017		 pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 5160 bytes
font_01_sfnt_off00007788.bin
0f2e8ce54381ea5d44722e83f2fb93aa73add2adcf0c5bfc0a401cbcdbd8330c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7788 10708 bytes

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