Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dff05acf88776d…

MALICIOUS

PDF

43.6 KB Created: 2020-08-06 23:08:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a281a3ce0feb8d65477ffe9705a8b72b SHA-1: a7ce32bdb1c95a9844ef8ef9e9c0540bc85399a4 SHA-256: 98dff05acf88776dced2236223a48106457d8bbb24e2d5d52a1078fe7f01c458
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on cdn.shopify.com. One of these links, https://ttraff.ru/pify?keyword=que+es+un+trauma+psicologico+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the redirector URL and the wkhtmltopdf tool, suggesting it was generated programmatically to host these links.

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=que+es+un+trauma+psicologico+pdf
    • http://files.seattleknittersguild.org/uploads/1/3/2/6/132681823/gajakovojazekufo.pdf
    • http://files.handymaninbristol.co.uk/uploads/1/3/2/8/132815207/d70311ea1b0278.pdf
    • http://files.wow2007.com/uploads/1/3/2/8/132814933/6950442.pdf
    • http://mexuku.hairbyemmac.net/uploads/1/3/1/4/131438177/de9c7f683e8d.pdf
    • https://cdn.shopify.com/s/files/1/0439/7072/3998/files/poderawijigubid.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/12729031526.pdf
    • https://cdn.shopify.com/s/files/1/0437/0923/5353/files/conversion_word_zamzar.pdf
    • https://cdn.shopify.com/s/files/1/0435/6797/2515/files/comment_installer_les_cameras_de_surveillance_ip.pdf
    • https://cdn.shopify.com/s/files/1/0431/4398/7357/files/sasogopagixip.pdf
    • https://cdn.shopify.com/s/files/1/0434/0878/5562/files/28272964561.pdf
    • https://cdn.shopify.com/s/files/1/0434/3506/5505/files/nodejs_read_file_line_by_line.pdf
    • https://cdn.shopify.com/s/files/1/0431/7321/6411/files/66221650259.pdf
    • https://cdn.shopify.com/s/files/1/0431/5725/8402/files/captopril_mecanismo_de_ao.pdf
    • https://cdn.shopify.com/s/files/1/0437/8198/0321/files/2006_honda_accord_owners_manual.pdf
    • https://cdn.shopify.com/s/files/1/0432/1889/5010/files/660583091.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_off00006893.bin
5c3ecd5da72d734208aa457147220570cb12233cf53dc71bc485d1b6d66635ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6893 5536 bytes
font_01_sfnt_off00007b4c.bin
4cba94146c1f513ef8bd791fc3d088293df7c795c163c58606511061680210c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B4C 11124 bytes

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