Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8f4c6b3e069ef82…

MALICIOUS

PDF

68.1 KB Created: 2020-08-15 04:38:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a636623bf3939ac2abaeac595d1b73e3 SHA-1: 30adac9fa51e80dd11ae8d40a27174dd8adaa914 SHA-256: e8f4c6b3e069ef82bbbffe0cd1f257db1deefd6cea6128072a8227a548ea07da
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to 'https://ttraff.cc/pify?keyword=indirect+speech+exercises+pdf+with+answers'. The document body, though heavily obfuscated, contains this URL and text suggesting it is an 'indirect speech exercises pdf with answers'. The PDF also exhibits characteristics of a link farm, with numerous links to external PDFs, likely to manipulate search engine results or distribute malicious content. 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=indirect+speech+exercises+pdf+with+answers
    • http://files.architecture3115.com/uploads/1/3/1/1/131163856/sunazegedizuninat.pdf
    • https://cdn.shopify.com/s/files/1/0429/8381/7375/files/puwuwijobifopelemoxumutog.pdf
    • https://cdn.shopify.com/s/files/1/0427/8606/2495/files/22925852099.pdf
    • https://cdn.shopify.com/s/files/1/0431/6869/4432/files/16913332742.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/8884130665.pdf
    • https://cdn.shopify.com/s/files/1/0428/1958/4166/files/natukinisekutomeg.pdf
    • https://cdn.shopify.com/s/files/1/0431/2550/6208/files/interview_tips_download.pdf
    • https://cdn.shopify.com/s/files/1/0430/1137/5267/files/sadizus.pdf
    • https://cdn.shopify.com/s/files/1/0435/4595/2408/files/bilingualism_vs_multilingualism.pdf
    • https://cdn.shopify.com/s/files/1/0434/3542/5944/files/91008456446.pdf
    • https://cdn.shopify.com/s/files/1/0432/3904/7336/files/44353429754.pdf
    • https://cdn.shopify.com/s/files/1/0432/6604/8164/files/86583712700.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b768.bin
b7f317aa0f29cd34df008dc84d8f376d2685882a57a4a5cd0d86477d0adf885a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB768 2828 bytes
font_01_sfnt_off0000c163.bin
a692cce34b67deca23e7f47b6b1d052625e47a74a08dfa32130fc10e6a22031b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC163 4984 bytes
font_02_sfnt_off0000d252.bin
6a8133e211a0439e3ddf9a1c685388ac17257706665650f93437a8a6e1d25b89		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD252 9996 bytes
font_03_sfnt_off0000f478.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF478 4324 bytes

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