Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5324be70775228e…

MALICIOUS

PDF

48.2 KB Created: 2020-08-21 21:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd0714aea0195ae58160105e045b6d5a SHA-1: bcbfbff30896c6ac2414427a625bb46f906275c9 SHA-256: f5324be70775228e9e48b2d8c386c7841eca9392f83052ab3e1413525a003068
150 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.cc/pify?keyword=l+blend+words+worksheet'. The document body, though heavily obfuscated, also contains this URL, suggesting it is the primary lure. The file also exhibits characteristics of a link farm, with numerous embedded URLs, many of which point to benign Shopify domains, likely used to obscure the malicious redirector. 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/pify?keyword=l+blend+words+worksheet
    • http://kaxavu.rewritingourstories.com/uploads/1/3/2/8/132814930/cd54d7d119.pdf
    • http://kugivivog.ritecookware.com/uploads/1/3/1/4/131453960/f43badd.pdf
    • http://files.unleashedlure.com/uploads/1/3/1/8/131871786/bbad73.pdf
    • http://vaxajun.trulymedium.com/uploads/1/3/2/3/132302921/7325384.pdf
    • https://cdn.shopify.com/s/files/1/0434/7192/9496/files/lovigufodipax.pdf
    • https://cdn.shopify.com/s/files/1/0430/7196/3296/files/80060027158.pdf
    • https://cdn.shopify.com/s/files/1/0459/2471/2597/files/78234110332.pdf
    • https://cdn.shopify.com/s/files/1/0440/7810/4728/files/net_framework_3._5_offline_xp.pdf
    • https://cdn.shopify.com/s/files/1/0433/7152/8344/files/80497088825.pdf
    • https://cdn.shopify.com/s/files/1/0428/0087/3631/files/77955728220.pdf
    • https://cdn.shopify.com/s/files/1/0448/0447/2992/files/equivalent_ratios_word_problems_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vunususojorimit.pdf
    • https://cdn.shopify.com/s/files/1/0432/1817/4107/files/73624011238.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_off00005c10.bin
f4e50f07846ae3c80273dbfe481bcdc43176dd648c456947d03d6946a30aa0f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5C10 4940 bytes
font_01_sfnt_off00006cef.bin
590d82f24368ed4a2937c5e37de5913bdd8e7de02184d37b7abf9a05db99c8bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6CEF 15700 bytes
font_02_sfnt_off00009f30.bin
a3b8ae6cb61a975f1aaa3bdf1d75290c2750726bc6c8d8b6ec62e4e9f5cc9978		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9F30 16084 bytes

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