Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f7668e03f516233…

MALICIOUS

PDF

34.0 KB Created: 2020-08-03 05:46:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a6bf78e4ae46f3822a2eb19d6e5d98e7 SHA-1: 274260d286588f812dc25be2450d026856ca0ee7 SHA-256: 4f7668e03f516233eed845ab4167b2400cb668e1c44928cb56e0d68ac92fa7f4
150 Risk Score

Malware Insights

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

The PDF contains a link to a redirector at 'https://ttraff.cc/pify?keyword=old+english+text+mt', which is flagged as malicious. The document also contains a large number of external PDF links, many hosted on Shopify, suggesting a link farm or SEO poisoning attempt. The ML classifier strongly indicated maliciousness. The presence of a malicious redirector URL is the primary indicator of the attack pattern.

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=old+english+text+mt
    • http://files.fccfrankfort.org/uploads/1/3/1/0/131070692/zibufatawexitosup.pdf
    • http://files.redsnail.com/uploads/1/3/1/3/131380469/5240272.pdf
    • http://files.washingtonpikeumc.org/uploads/1/3/1/6/131607522/8923877.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/4789519554.pdf
    • https://cdn.shopify.com/s/files/1/0435/5473/4235/files/engineering_graphics_with_autocad_2014.pdf
    • https://cdn.shopify.com/s/files/1/0428/0179/1132/files/malayalam_kambi_katha.pdf
    • https://cdn.shopify.com/s/files/1/0434/5446/4165/files/sedomopitugevoworajaza.pdf
    • https://cdn.shopify.com/s/files/1/0432/0120/0288/files/rupeva.pdf
    • https://cdn.shopify.com/s/files/1/0427/9386/1279/files/kupagutawisudojagatatuji.pdf
    • https://cdn.shopify.com/s/files/1/0428/7568/2972/files/xefukiwi.pdf
    • https://cdn.shopify.com/s/files/1/0438/5921/4496/files/63893634172.pdf
    • https://cdn.shopify.com/s/files/1/0437/6687/4269/files/jewojuritixedufosiwuw.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/sitadekekogog.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_off00004957.bin
1dd0c8d9472182b0c715658324256ae8d2c857ef91752e2bcc5927e13e8ec3d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4957 5028 bytes
font_01_sfnt_off00005a53.bin
6a3ff3de4f7802ddc1be7087b1b0e06467663e4ff8cd8c913960725475dae63d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5A53 9788 bytes

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