Malicious PDF — malware analysis report

Static analysis result for SHA-256 9aa8f6c83dc85c1b…

MALICIOUS

PDF

100.1 KB Created: 2020-08-12 09:56:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ae7d63e890991679c94901934fda105 SHA-1: 4f0dd7ccf0a3702fff64a0658be05a75eeef54a5 SHA-256: 9aa8f6c83dc85c1b713dca5d3692fb82e76a7b9abe8f201c23ea39f58cf8ad26
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'. Additionally, it exhibits characteristics of a PDF link farm, with numerous embedded URLs, many of which are likely SEO-driven. The ML classifier also strongly flagged this PDF as malicious. The presence of a malicious redirector suggests the document is designed to lead users to harmful content or further exploitation.

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=anorexia+nervosa+causes+pdf
    • http://keger.sojofireproject.org/uploads/1/3/0/7/130739777/446072.pdf
    • http://files.gogginslonestarfarms.com/uploads/1/3/0/9/130969428/712bb2d947d352.pdf
    • http://files.internallyflawlex.net/uploads/1/3/0/7/130775646/kozokenonedanofimar.pdf
    • http://files.berlinartclass.com/uploads/1/3/1/4/131453684/7741492.pdf
    • https://cdn.shopify.com/s/files/1/0436/8783/7849/files/solution_book_of_thomas_calculus_12th_edition.pdf
    • https://cdn.shopify.com/s/files/1/0433/6569/5638/files/pamexamifudojuwag.pdf
    • https://cdn.shopify.com/s/files/1/0430/9309/8660/files/vuduposodadipe.pdf
    • https://cdn.shopify.com/s/files/1/0431/4864/0418/files/pagevobegorezezaliboxege.pdf
    • https://cdn.shopify.com/s/files/1/0431/0191/3244/files/93632178714.pdf
    • https://cdn.shopify.com/s/files/1/0434/6934/0822/files/gibozukejiwezivi.pdf
    • https://cdn.shopify.com/s/files/1/0428/2269/7126/files/juremogukawotokibatigedez.pdf
    • https://cdn.shopify.com/s/files/1/0435/1374/1471/files/tewuboropoxisurokaw.pdf
    • https://cdn.shopify.com/s/files/1/0436/6604/7129/files/salaxagoze.pdf
    • https://cdn.shopify.com/s/files/1/0431/9395/8560/files/canciones_acordes_para_guitarra.pdf
    • https://cdn.shopify.com/s/files/1/0431/8045/8144/files/riwowememitu.pdf
    • https://cdn.shopify.com/s/files/1/0434/4895/9142/files/hbr_guide_to_better_business_writing_free.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_off000143a4.bin
39e1b71a003b6370f929e2a9aa716a394ba48b7489735d0f5a9d081daab257a7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x143A4 5232 bytes
font_01_sfnt_off00015585.bin
b1f13b516e0ed53e953ba526d1c0bd910fcc4f0a1086f9b4fc7c49c3bafd29f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15585 14428 bytes

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