Malicious PDF — malware analysis report

Static analysis result for SHA-256 523d892bac092941…

MALICIOUS

PDF

64.6 KB Created: 2020-08-17 05:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9bf76822421e409e1d246804b4296169 SHA-1: 48f4c62c6b59b1ec60290d40a3d5460b91637819 SHA-256: 523d892bac0929418bc436652d05e135b29c589e0deed6a157eb57ae75f5f13e
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. Additionally, it exhibits a PDF link farm behavior, with numerous links to Shopify domains, likely for SEO poisoning or to obscure the malicious redirector. The ML classifier also strongly flagged this PDF as malicious. The document body, though heavily obfuscated, contains the malicious URL, suggesting a lure to download content.

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/pify?keyword=ahmed+chawki+tsunami+song
    • http://files.sobla.net/uploads/1/3/1/4/131483138/nukusunuvep.pdf
    • https://cdn.shopify.com/s/files/1/0434/5122/0134/files/22422549517.pdf
    • https://cdn.shopify.com/s/files/1/0433/3164/9689/files/diagnostic_imaging_obstetrics_woodward.pdf
    • https://cdn.shopify.com/s/files/1/0431/0063/5290/files/munuf.pdf
    • https://cdn.shopify.com/s/files/1/0432/7541/9798/files/58637706632.pdf
    • https://cdn.shopify.com/s/files/1/0432/1011/3188/files/78280064017.pdf
    • https://cdn.shopify.com/s/files/1/0428/1732/3175/files/zikigupodivu.pdf
    • https://cdn.shopify.com/s/files/1/0437/6874/2046/files/lusty_argonian_maid.pdf
    • https://cdn.shopify.com/s/files/1/0440/8547/7541/files/39982163221.pdf
    • https://cdn.shopify.com/s/files/1/0430/6518/0321/files/titanium_backup_app_free.pdf
    • https://cdn.shopify.com/s/files/1/0438/5511/8501/files/ramevebefewawerova.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
stream_006_off0000c461.bin
b029391aed143837323f78709a3462e1417486c001b543848d305c1c46b7b03e		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xC461 26960 bytes
font_00_sfnt_off0000856f.bin
ca15f0881a5356269aeadbd0c7674e7a42148274e2fb6c58df11b1fd64e0b7c3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x856F 5368 bytes
font_01_sfnt_off0000979f.bin
320c61c696d4d8da1a325b06224335fb274b839653188230aeb2ace1e3b4435e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x979F 14408 bytes

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