Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f3f446c4ee4f957…

MALICIOUS

PDF

40.7 KB Created: 2020-08-15 19:59:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 000a3782e7d8dca24d6b5c54f3d73e22 SHA-1: 80f53ce01d4acaa871fd1c735167e0dfe4e06ccf SHA-256: 4f3f446c4ee4f957a15ac9ac0af6d41cbf60abed2a4c8c269702542f20561302
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 'https://ttraff.ru/wb?keyword=pyes%20gov%20ng%20files%20pyes%20guarantor%20form%20pdf'. This URL is presented within the document body, disguised as a government form, to entice users to click. The PDF also contains a link farm heuristic, indicating a large number of outbound links, with the first being 'https://cdn.shopify.com/s/files/1/0435/4398/6327/files/gitovo.pdf'. The ML classifier strongly supports the malicious nature of this PDF.

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/wb?keyword=pyes%20gov%20ng%20files%20pyes%20guarantor%20form%20pdf
    • http://files.globalwarmingcompany.com/uploads/1/3/1/4/131407274/milavow-kadodu-rumanatuxo.pdf
    • http://files.ellipseatlantic.com/uploads/1/3/1/0/131070173/mibezogez.pdf
    • http://files.digitalindy.biz/uploads/1/3/0/8/130814226/sejovuwewemolune.pdf
    • https://cdn.shopify.com/s/files/1/0435/4398/6327/files/gitovo.pdf
    • https://cdn.shopify.com/s/files/1/0440/4926/8886/files/60502245177.pdf
    • https://cdn.shopify.com/s/files/1/0434/9798/0056/files/fazurawatorewelobobi.pdf
    • https://cdn.shopify.com/s/files/1/0431/7796/7776/files/66714420525.pdf
    • https://cdn.shopify.com/s/files/1/0435/2717/6344/files/logical_operators_and_truth_tables.pdf
    • https://cdn.shopify.com/s/files/1/0445/2735/4015/files/cheerios_box_template.pdf
    • https://cdn.shopify.com/s/files/1/0437/5258/7415/files/57419539422.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/baxumedufimoval.pdf
    • https://cdn.shopify.com/s/files/1/0436/8980/3941/files/18199915979.pdf
    • https://cdn.shopify.com/s/files/1/0430/7379/8306/files/provinsi_bengkulu_dalam_angka_2020.pdf
    • https://cdn.shopify.com/s/files/1/0427/6482/8838/files/39809245152.pdf
    • https://cdn.shopify.com/s/files/1/0432/1961/5901/files/makinet.pdf
    • https://cdn.shopify.com/s/files/1/0431/7125/0336/files/types_of_functions_maths.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_off00006026.bin
82faf8b3c614798d3f5f99d69d848a065465952b1be0b6fd05213ea80923dec9
pdf-font-stream PDF embedded font (sfnt) at offset 0x6026 5524 bytes
font_01_sfnt_off000072e3.bin
871516f36dcc84ca93d33493681b949de26d774354c1be17704f2a8b703c0ea4
pdf-font-stream PDF embedded font (sfnt) at offset 0x72E3 10288 bytes