Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd6f7b4feca9a0fd…

MALICIOUS

PDF

52.0 KB Created: 2020-08-12 10:03:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5581aff294fe1facd5f993e86ea41f5 SHA-1: 1d07185251ef1bca77a1e7c50007d543643142cf SHA-256: bd6f7b4feca9a0fda995781b44af7a88cd62807e96da24c44eebb1df8c28966f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, 'https://ttraff.cc/pify?keyword=bengali+alphabet+writing+practice+pdf', is identified as a malicious redirector. The document body, though heavily obfuscated, contains this same URL, suggesting the primary intent is to redirect the user to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious.

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=bengali+alphabet+writing+practice+pdf
    • http://files.philadelphiahappenings.com/uploads/1/3/0/7/130776720/9579335.pdf
    • http://files.thelastnightofmytwenties.com/uploads/1/3/0/7/130775704/2406223.pdf
    • http://files.brothersinthewild.com/uploads/1/3/0/7/130739802/lokewavudukodig.pdf
    • https://cdn.shopify.com/s/files/1/0448/2508/4065/files/baby_animal_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0433/5026/1915/files/40882201523.pdf
    • https://cdn.shopify.com/s/files/1/0437/0900/5978/files/historia_de_brujas_belgica.pdf
    • https://cdn.shopify.com/s/files/1/0435/1646/1211/files/93078984548.pdf
    • https://cdn.shopify.com/s/files/1/0434/3591/7464/files/73380169867.pdf
    • https://cdn.shopify.com/s/files/1/0435/3084/6363/files/wow_vanilla_herbalism_guide.pdf
    • https://cdn.shopify.com/s/files/1/0435/5552/0667/files/59972558372.pdf
    • https://cdn.shopify.com/s/files/1/0435/0833/4744/files/gramatyka_angielski_matura.pdf
    • https://cdn.shopify.com/s/files/1/0432/0726/2367/files/farepojigefikovixowa.pdf
    • https://cdn.shopify.com/s/files/1/0431/6931/7020/files/57486344913.pdf
    • https://cdn.shopify.com/s/files/1/0433/7103/6835/files/45295158758.pdf
    • https://cdn.shopify.com/s/files/1/0428/3373/9932/files/rifenubo.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007613.bin
b9550354b2559119ebce9fd3794ed765b9582ee29dc3c734ba8464a5ee0cf468
pdf-font-stream PDF embedded font (sfnt) at offset 0x7613 5520 bytes
font_01_sfnt_off000088d1.bin
f5cedf05800b4edef515ae8391c6beb866020751da7bc2697f448314adb699d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x88D1 6212 bytes
font_02_sfnt_off00009d3b.bin
8f59f1a8559049b049c1a3d1f67f6ed62afec7ac165777901c35d46956a26c53
pdf-font-stream PDF embedded font (sfnt) at offset 0x9D3B 11268 bytes