Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf28cad0ed2c262…

MALICIOUS

PDF

43.9 KB Created: 2020-08-22 22:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e70a9131412d7e90f3168a6a43d655b SHA-1: 92b70ca0c7538709b97dc9526fbaf3b5b481ea1d SHA-256: 4bf28cad0ed2c2625f341c36b4ab1ce2313f549c1c58cbb0be3b1914f7a19f37
150 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link pointing to 'ttraff.ru'. This URL is presented within the document body, disguised as a link to a 'criminal case game online free'. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs, many hosted on Shopify. The ML classifier strongly indicates maliciousness. The primary attack vector appears to be luring the user to the malicious redirector.

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=criminal+case+game+online+free
    • http://files.rebornfestival.com/uploads/1/3/1/6/131637419/wedese.pdf
    • http://files.madrasitekwani.com/uploads/1/3/1/4/131409761/gabewonivepum.pdf
    • http://files.balloontwistersdcvamd.com/uploads/1/3/0/9/130969375/gipagazovupibiz_tolokaduwimola.pdf
    • http://denupob.davidstraange.com/uploads/1/3/2/7/132740930/3978507.pdf
    • https://cdn.shopify.com/s/files/1/0432/2813/5592/files/27495749379.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/16949815227.pdf
    • https://cdn.shopify.com/s/files/1/0429/7293/8399/files/potentiometric_biosensors.pdf
    • https://cdn.shopify.com/s/files/1/0428/3714/7811/files/tezabijomuwige.pdf
    • https://cdn.shopify.com/s/files/1/0435/0876/0742/files/saxophone_scales_and_arpeggios.pdf
    • https://cdn.shopify.com/s/files/1/0438/1537/0912/files/40503413894.pdf
    • https://cdn.shopify.com/s/files/1/0452/0719/1701/files/xedinupeputobodobemu.pdf
    • https://cdn.shopify.com/s/files/1/0431/8344/0030/files/85901657607.pdf
    • https://cdn.shopify.com/s/files/1/0439/2907/5880/files/essential_of_understanding_psychology_11th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0431/9854/6082/files/ridoderuna.pdf
    • https://cdn.shopify.com/s/files/1/0430/6527/8625/files/mazekefekuvekuteronu.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/tanedikefiresemur.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_off00006e44.bin
2ed77a418d46da3c8d7851cf89bd08604d0f5b2924e45f370c904b2f9744e6ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x6E44 5104 bytes
font_01_sfnt_off00007f81.bin
5e13a5adbef77d148d19744ead08f25082ad11535bea8c220fdcaa23700725be
pdf-font-stream PDF embedded font (sfnt) at offset 0x7F81 10292 bytes