Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf5a8420a6714652…

MALICIOUS

PDF

42.1 KB Created: 2020-08-02 09:21:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 99550a1502447d6781ea5ae53fd28de9 SHA-1: 13ba5f45bc31c40cf53e120cf6828b1f8d0e2ef3 SHA-256: bf5a8420a67146526735f6ad8c063bb01ae791d59e36e1f906bdc3053b5f7d2c
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'https://ttraff.com/pify?keyword=uc+davis+ship+waiver'. This URL is likely used to redirect the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and appears to be a lure related to a "Uc davis ship waiver". The presence of numerous external PDF links, many hosted on Shopify, suggests a link farm for SEO poisoning or to distribute further payloads.

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.com/pify?keyword=uc+davis+ship+waiver
    • http://files.factsnsf.org/uploads/1/3/1/4/131482823/fevejevibobas.pdf
    • http://files.universalhighways.com/uploads/1/3/1/4/131406222/ce8e3cdc50e7f.pdf
    • http://files.blueabstractart.com/uploads/1/3/0/8/130874217/27d4b3f4eb.pdf
    • https://cdn.shopify.com/s/files/1/0429/6792/4899/files/65986072056.pdf
    • https://cdn.shopify.com/s/files/1/0433/7614/8638/files/24543020798.pdf
    • https://cdn.shopify.com/s/files/1/0429/6926/8383/files/vamozivudokutagenew.pdf
    • https://cdn.shopify.com/s/files/1/0440/8786/9592/files/popisaxujubuz.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/88020392138.pdf
    • https://cdn.shopify.com/s/files/1/0429/3469/8147/files/lajalabaverenu.pdf
    • https://cdn.shopify.com/s/files/1/0435/9425/2456/files/pezedejimokivixupufifi.pdf
    • https://cdn.shopify.com/s/files/1/0432/6948/8798/files/dns_server_isn_t_responding.pdf
    • https://cdn.shopify.com/s/files/1/0427/9681/0396/files/xavafesejiramun.pdf
    • https://cdn.shopify.com/s/files/1/0434/0921/1557/files/99085074949.pdf
    • https://cdn.shopify.com/s/files/1/0437/3459/7784/files/88957792300.pdf
    • https://cdn.shopify.com/s/files/1/0429/6821/9799/files/iso_to_xbe.pdf
    • https://cdn.shopify.com/s/files/1/0430/2353/2195/files/snowbird_weather_forecast.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_off00006559.bin
7f1af821e1146a510f98305e07a43fd4ccaef8872ca360a6b1b601ccc4b5ef81		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6559 5272 bytes
font_01_sfnt_off0000775b.bin
8796dd0c4e676e60edf6577c689cbcd7fcdec989ff41b2954833f55b29f61f24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x775B 10720 bytes

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