Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3579e4c73b430b9…

MALICIOUS

PDF

45.7 KB Created: 2020-08-12 21:00:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b8ef1c9b3cde92b96588aba7f2ac9445 SHA-1: 99b9d08f9f88a78ff6949b4a4c292e11a4cf34e2 SHA-256: f3579e4c73b430b9e6799cad3e5667440ea1bf4d0c1d2a0cd0359abf5e018459
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDFs, a common tactic for SEO poisoning and link farming. One of these links, "https://ttraff.com/pify?keyword=basics+of+model+aircraft+design+pdf", is identified as a malicious redirector. The document body, though heavily obfuscated, contains this URL and references "wkhtmltopdf", suggesting it was generated programmatically to host these links. The primary attack pattern involves luring users to a malicious redirector.

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=basics+of+model+aircraft+design+pdf
    • http://ligojate.arkiteka.com.au/uploads/1/3/1/3/131384169/2214794.pdf
    • http://sipit.worldofsong.com/uploads/1/3/1/4/131453850/sejevusemusopuk.pdf
    • http://files.youthmariachi.com/uploads/1/3/2/3/132303175/27b1b4.pdf
    • http://files.busterscinematicuniverse.com/uploads/1/3/1/4/131437330/5ad14.pdf
    • https://cdn.shopify.com/s/files/1/0429/2119/7724/files/84487079960.pdf
    • https://cdn.shopify.com/s/files/1/0440/8151/2613/files/90610010565.pdf
    • https://cdn.shopify.com/s/files/1/0433/2670/1723/files/99332439192.pdf
    • https://cdn.shopify.com/s/files/1/0429/6700/7386/files/certificate_of_compliance_electrical.pdf
    • https://cdn.shopify.com/s/files/1/0454/6635/3814/files/soda_10_crack.pdf
    • https://cdn.shopify.com/s/files/1/0434/2510/4028/files/ages_and_stages_questionnaire_42_months.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/odisha_b._ed_question_paper_2020_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/5421/0980/files/learn_german_grammar_a1.pdf
    • https://cdn.shopify.com/s/files/1/0437/0549/9801/files/jigabedozivop.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_off000067de.bin
6d28fd752f58a5ccc8e04bd5a143a717ee716f610929008db606228a818704bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x67DE 5312 bytes
font_01_sfnt_off000079c7.bin
4422258b11d2bf704067e7467d7072c6c957046251bfab681b624e58a9990478		 pdf-font-stream PDF embedded font (sfnt) at offset 0x79C7 10052 bytes
font_02_sfnt_off00009bdf.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9BDF 4324 bytes

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