Malicious PDF — malware analysis report

Static analysis result for SHA-256 de51c749ecac4d86…

MALICIOUS

PDF

46.9 KB Created: 2020-07-31 15:23:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a8950e0ff7f58eee7fc0bf639bc10963 SHA-1: d6c9dc62910905568f899bd7607356321958a3e9 SHA-256: de51c749ecac4d8690355df075e4f83def9fa1ced422fdae696ff43e8036303e
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically pointing to a known malicious redirector. The document body, though heavily obfuscated, contains text related to 'how to screen share in discord', likely a lure to disguise the malicious intent. The heuristic PDF_MALICIOUS_REDIRECTOR_LINK confirms the presence of links to malicious infrastructure, and PDF_SEO_LINK_FARM indicates a large number of external links, suggesting a link farm or redirection scheme.

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=how+to+screen+share+in+discord
    • http://files.ontarioplay.com/uploads/1/3/0/9/130969231/1984018.pdf
    • http://files.artsower.com/uploads/1/3/0/7/130738614/biwepurosi_ximerowil_mepijapaju.pdf
    • http://files.adriennecarlile.com/uploads/1/3/0/7/130739180/7fb71e1947484e5.pdf
    • http://files.professionalpropertytraining.com/uploads/1/3/1/4/131408970/xolirawofuvaraxa.pdf
    • http://files.bonzaiii.com/uploads/1/3/1/8/131872303/9d82144b7e13.pdf
    • https://cdn.shopify.com/s/files/1/0428/2089/4886/files/xozenutawaw.pdf
    • https://cdn.shopify.com/s/files/1/0432/9380/2646/files/86120700056.pdf
    • https://cdn.shopify.com/s/files/1/0429/4885/3926/files/97743026740.pdf
    • https://cdn.shopify.com/s/files/1/0440/7109/2376/files/tijilurabebasereg.pdf
    • https://cdn.shopify.com/s/files/1/0433/5930/5880/files/94814536522.pdf
    • https://cdn.shopify.com/s/files/1/0431/3861/3415/files/8885948919.pdf
    • https://cdn.shopify.com/s/files/1/0432/0896/6301/files/tuzeburowetujunanuke.pdf
    • https://cdn.shopify.com/s/files/1/0429/3689/3599/files/9398893921.pdf
    • https://cdn.shopify.com/s/files/1/0429/0193/0143/files/46881822555.pdf
    • https://cdn.shopify.com/s/files/1/0427/8360/4903/files/fipuzebelerozu.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_off00007a5f.bin
e718d7d72036bfa7184ff5a425d8a062f681a5191dec7a97e3ce0287faa1b616		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A5F 4836 bytes
font_01_sfnt_off00008ac2.bin
adb65b8b6e6448e011ffe5e51d036e42c6fafbc1886c890aa8b68036b1841776		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8AC2 10424 bytes

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