Malicious PDF — malware analysis report

Static analysis result for SHA-256 f83670a4ab7620cb…

MALICIOUS

PDF

45.0 KB Created: 2020-08-23 21:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ea0f8f8408f221bf22927abdebefa4 SHA-1: 56e01af7aed3ac5e0c4c041f86e03b1df4865abe SHA-256: f83670a4ab7620cb8ee956b1236e5c6928fc2cb2f1baaa22e3e1a43104422851
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a heuristic firing for a malicious redirector link, specifically pointing to 'https://ttraff.com/pify?keyword=ncert+books+class+6+maths+pdf'. This URL is designed to redirect users to potentially harmful content. Additionally, the document exhibits characteristics of a link farm, embedding numerous external PDF links, many hosted on Shopify. The presence of the 'ncert books class 6 maths pdf' keyword in the malicious URL suggests a lure to attract users seeking educational materials.

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.com/pify?keyword=ncert+books+class+6+maths+pdf
    • http://files.besselingconstruction.ca/uploads/1/3/1/4/131453256/buxexefa_pokegekitunaj_lomavuxenowuti.pdf
    • https://cdn.shopify.com/s/files/1/0431/4628/1121/files/zulewemusumififesosufa.pdf
    • https://cdn.shopify.com/s/files/1/0429/3227/3319/files/disegekufalozanevabij.pdf
    • https://cdn.shopify.com/s/files/1/0429/1434/9215/files/55681954917.pdf
    • https://cdn.shopify.com/s/files/1/0437/4292/0869/files/79395060451.pdf
    • https://cdn.shopify.com/s/files/1/0434/2225/3205/files/last_wishes_letter_template.pdf
    • https://cdn.shopify.com/s/files/1/0427/8714/3839/files/2305235892.pdf
    • https://cdn.shopify.com/s/files/1/0433/4842/6902/files/guxexogoseba.pdf
    • https://cdn.shopify.com/s/files/1/0433/7372/3811/files/pomedalomudorat.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/fosofixufexig.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_off00006680.bin
be568fa77fbf2da68ce1c4970e72b2d6c1db17c1f899b8032c55ea340d433d50		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6680 5720 bytes
font_01_sfnt_off000079d1.bin
57da54f39d4badd12821b6a4877d1e7ab13dfa6946e203eca2b756595abfa207		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79D1 14744 bytes

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