Malicious PDF — malware analysis report

Static analysis result for SHA-256 1abec843f6926406…

MALICIOUS

PDF

42.2 KB Created: 2020-08-15 12:38:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b0933d0861737678d4f4cd76b1d1fdd4 SHA-1: f22e202666f18aa2368abad549a5b4bf773ae8a6 SHA-256: 1abec843f69264062bfc535a19815e873ca0edb401d798ed26c25f6deb5a721a
150 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a critical heuristic identifying a link to a known malicious redirector at https://ttraff.ru/wb?keyword=biogenesis%20definicion%20pdf. The document body, though heavily obfuscated, contains references to 'Biogenesis definicion pdf' and the authoring application 'wkhtmltopdf', suggesting a lure document. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves redirecting the user to malicious infrastructure.

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=biogenesis%20definicion%20pdf
    • http://files.deanzamoa.org/uploads/1/3/1/3/131398455/4580474.pdf
    • http://pinaxifu.mcallikat.com/uploads/1/3/0/7/130775244/judomu.pdf
    • https://cdn.shopify.com/s/files/1/0427/9074/8316/files/wasowagujus.pdf
    • https://cdn.shopify.com/s/files/1/0431/8514/3965/files/ejercicios_bisectriz_y_mediatriz_6_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0431/7757/4557/files/kotejevimonojotozewi.pdf
    • https://cdn.shopify.com/s/files/1/0434/6239/4021/files/24795793455.pdf
    • https://cdn.shopify.com/s/files/1/0434/3755/5868/files/verbal_analogies_test.pdf
    • https://cdn.shopify.com/s/files/1/0432/9639/1323/files/30315435899.pdf
    • https://cdn.shopify.com/s/files/1/0434/6983/2354/files/ketelatid.pdf
    • https://cdn.shopify.com/s/files/1/0447/7540/7782/files/zodudirifetoloboj.pdf
    • https://cdn.shopify.com/s/files/1/0435/4542/8127/files/noriwezulivuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/6827/6384/files/bhartiya_itihas_evam_rashtriya_andolan.pdf
    • https://cdn.shopify.com/s/files/1/0429/0258/5500/files/xadobimigupasukazuzimisef.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/37278413385.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_off0000672a.bin
bc9c57e752d30ac78dd96cc184d9730774edf46d3dd6bb41b10feaf7cd52b7fc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x672A 5036 bytes
font_01_sfnt_off00007864.bin
b88642c879a114c540067a49e26819c0c25f117d122c1be1ce7c7a5be6ef1739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7864 10504 bytes

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