Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fd351d6c694412…

MALICIOUS

PDF

45.1 KB Created: 2020-08-15 16:40:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 04beb598f6c3627e98c7b58afc0d8bd0 SHA-1: 4987e4ba659457a0a829d52bc3d30e5265eca234 SHA-256: a7fd351d6c69441201aa9a0671960e73395a7d484f3097254b1f32465a1820c2
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 'ttraff.cc'. The document body, though heavily obfuscated, contains the same URL and keywords related to 'utorrent location android', suggesting a lure. Additionally, a large number of embedded links were found, many pointing to Shopify domains, indicating a link farm designed to obscure the final malicious destination. 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/pify?keyword=utorrent++location+android
    • http://files.alessandrobianchetti.com/uploads/1/3/1/6/131607407/nirupeduvumupi.pdf
    • http://vebomigo.melindayoungmd.com/uploads/1/3/1/4/131406062/1020301.pdf
    • http://ritidis.thekellyjaye.com/uploads/1/3/1/4/131453574/rodofozotesiti.pdf
    • http://lepaduv.greenvillecoc.org/uploads/1/3/1/1/131164250/6107882.pdf
    • https://cdn.shopify.com/s/files/1/0435/2193/3466/files/vefezutavetubarubuvem.pdf
    • https://cdn.shopify.com/s/files/1/0436/6653/8649/files/40751660362.pdf
    • https://cdn.shopify.com/s/files/1/0429/7719/8229/files/jhumka_gira_ray.pdf
    • https://cdn.shopify.com/s/files/1/0433/5170/3706/files/73405546513.pdf
    • https://cdn.shopify.com/s/files/1/0435/6934/8763/files/pagevukoxanuke.pdf
    • https://cdn.shopify.com/s/files/1/0428/9485/2252/files/10513448922.pdf
    • https://cdn.shopify.com/s/files/1/0437/7575/4389/files/kobazeteme.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_off000066c3.bin
8403e0b9e51f483343f815d1bc70a76ceed3f38c0c7bb1d0831e07752be9067d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66C3 4532 bytes
font_01_sfnt_off00007626.bin
80ebc2c1c944f73daf16d27da9cb338873a3db2881175f9a9944d986444f6a34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7626 10364 bytes
font_02_sfnt_off000099ae.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x99AE 4324 bytes

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