Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f97af58063e6080…

MALICIOUS

PDF

43.2 KB Created: 2020-08-07 04:20:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bca47efa215cb7d6aeb6be49773b155a SHA-1: 6307f665136981ae6f0ab53f641f7224eef77106 SHA-256: 3f97af58063e6080dbb3100ca34d210d1ab223021b0a6adccb8a7665a88e1195
150 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, pointing to ttraff.ru. This URL is embedded within the document body, disguised as a search result for a PDF. The presence of a large number of external links, many pointing to Shopify domains, suggests a link farm or SEO poisoning tactic to distribute malicious content. The ML classifier also strongly indicated maliciousness.

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=gross+anatomy+of+digestive+system+pdf
    • http://files.wyattclark.net/uploads/1/3/1/4/131453054/3161625.pdf
    • http://files.rooseveltelementarypto.org/uploads/1/3/1/8/131857914/569dd39a6f.pdf
    • http://files.uilmusicregion6.com/uploads/1/3/0/7/130740210/4407185.pdf
    • http://files.merrimackreview.com/uploads/1/3/1/8/131856815/vewosi-pidapipikisez-tumawixa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3361/6803/files/60788372327.pdf
    • https://cdn.shopify.com/s/files/1/0432/8695/4140/files/33823392673.pdf
    • https://cdn.shopify.com/s/files/1/0430/8051/5738/files/install_jenkins_on_ubuntu.pdf
    • https://cdn.shopify.com/s/files/1/0435/7311/7091/files/embroidery_stitches_book_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0435/2642/2696/files/futawurisosata.pdf
    • https://cdn.shopify.com/s/files/1/0432/2033/6802/files/27790099699.pdf
    • https://cdn.shopify.com/s/files/1/0429/2627/6771/files/9405692144.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nudukesobiji.pdf
    • https://cdn.shopify.com/s/files/1/0430/6649/1041/files/44823095312.pdf
    • https://cdn.shopify.com/s/files/1/0430/6819/4965/files/46270040948.pdf
    • https://cdn.shopify.com/s/files/1/0433/9957/7756/files/idiomatic_language.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_off000069a4.bin
6981cbb9401b6fdc2645d48be24535a13c7852668b11531653438290b03d6973		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69A4 5524 bytes
font_01_sfnt_off00007c6c.bin
62a49058d2be74c88e05c494e85deb3477b340d8e1d9bd3032f21177fc46b4a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7C6C 10444 bytes

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