Malicious PDF — malware analysis report

Static analysis result for SHA-256 b050a5e660346a97…

MALICIOUS

PDF

42.3 KB Created: 2020-08-29 23:20:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bfe1a9c8f7cd0312ad82e549cb23f7cd SHA-1: 367c593a9a20664ff5e56f3395b79956bc23186a SHA-256: b050a5e660346a97b35dae60cb11a5525e94edcfef4e1fa19ade2e2d81966aa6
150 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, ttraff.cc, disguised with a keyword related to 'Nier automata save data'. This indicates a social engineering attempt to trick the user into visiting a malicious site. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external resources, many of which are benign but likely serve to obscure the malicious link. The ML classifier 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=nier+automata+save+data
    • https://static.usrfiles.com/ugd/9e53d4_f2a05b4df7684ed98a9a0cd8172aa021.pdf
    • https://static.usrfiles.com/ugd/9ea9b6_be6387e784dc413884cd57fd46bb5dd7.pdf
    • https://static.usrfiles.com/ugd/e33828_5c32fb54bfe54cc1bd42fc3b6aa949b0.pdf
    • https://static.usrfiles.com/ugd/b8c837_9c0e9fdcae2349c7a7723f529029c282.pdf
    • https://cdn.shopify.com/s/files/1/0435/9674/2815/files/34687498334.pdf
    • https://cdn.shopify.com/s/files/1/0429/7916/4314/files/zipitobanudinife.pdf
    • https://cdn.shopify.com/s/files/1/0430/1750/2869/files/vupuv.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/wogorogituxejawakewek.pdf
    • https://cdn.shopify.com/s/files/1/0434/0521/3847/files/33039672162.pdf
    • https://cdn.shopify.com/s/files/1/0433/8640/5022/files/kifugamexemuvesaleze.pdf
    • https://cdn.shopify.com/s/files/1/0434/0596/7527/files/vizuvaref.pdf
    • https://cdn.shopify.com/s/files/1/0434/8638/0189/files/komazevuzigaruru.pdf
    • https://cdn.shopify.com/s/files/1/0434/4774/6721/files/the_ass_saw_the_angel.pdf
    • https://cdn.shopify.com/s/files/1/0436/1352/0029/files/6939912358.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_off00005a32.bin
e3692abbbd41d65f32d728cbd8dbfd34429d778aaa33d5091cb964b316091bf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A32 4744 bytes
font_01_sfnt_off00006a54.bin
42dbd5d886d985896b58265428e2d32bfc83dc6e484cce9be0ebd9493c6e8f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A54 10604 bytes
font_02_sfnt_off00008e97.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8E97 4324 bytes

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