Malicious PDF — malware analysis report

Static analysis result for SHA-256 91250b00436fa9a2…

MALICIOUS

PDF

51.8 KB Created: 2020-08-17 06:44:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd73b42be48f336971a6bdbdc2fd396c SHA-1: 8b0d1f2640e5ed768816b9e0d04c69de016c3c82 SHA-256: 91250b00436fa9a24f550ba6aab735cc9fb46301eebc08699541c96cb0e674a6
150 Risk Score

Malware Insights

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

The PDF contains a link farm and a critical heuristic firing for a malicious redirector. The embedded URL 'https://ttraff.cc/pify?keyword=hbs+management+consulting+club+case+interview+guide' is the primary indicator of malicious intent, likely serving as a lure to a phishing or malware distribution site. The document body, though heavily corrupted, contains fragments suggesting a lure related to business consulting guides.

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=hbs+management+consulting+club+case+interview+guide
    • http://files.odylicforce.co.uk/uploads/1/3/1/8/131856380/aa4eb6d0f1d0.pdf
    • https://cdn.shopify.com/s/files/1/0437/2096/6298/files/tukaxun.pdf
    • https://cdn.shopify.com/s/files/1/0434/1995/9454/files/luvekafazaw.pdf
    • https://cdn.shopify.com/s/files/1/0435/1796/8543/files/pubg_server_locations.pdf
    • https://cdn.shopify.com/s/files/1/0439/2579/9067/files/93990120430.pdf
    • https://cdn.shopify.com/s/files/1/0429/9636/7511/files/15293456752.pdf
    • https://cdn.shopify.com/s/files/1/0429/9869/4042/files/19896508731.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/rowebufupex.pdf
    • https://cdn.shopify.com/s/files/1/0439/5958/2878/files/livejunibajaminabumiwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/1612/6625/files/buruxamusafiwutefi.pdf
    • https://cdn.shopify.com/s/files/1/0429/7415/0809/files/foxtel_go_android_app.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008b96.bin
380d4b62df5ff9beaa3ce3824d30ed0826de8a81e4ffdcfb354575a264762138		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B96 5512 bytes
font_01_sfnt_off00009e35.bin
01a7f84d1f815b5c398b5ca47becff55327f2ea7768469c0e0804b52a6c04f1c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E35 10520 bytes

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