Malicious PDF — malware analysis report

Static analysis result for SHA-256 950d4c9c57bcbed6…

MALICIOUS

PDF

44.7 KB Created: 2020-07-31 11:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b028d91dbe5f1fd18d2007d434475fc1 SHA-1: b9b689aaa805848b7f92875d15e628656f0ca395 SHA-256: 950d4c9c57bcbed6da8bd9d61d893721242815d6bf661f9a404642fca1169d12
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains multiple heuristics indicating malicious intent, specifically linking to known malicious redirector infrastructure and a large number of external PDF links, suggesting a link farm or phishing lure. The ML classifier strongly supports this assessment. The document body is heavily obfuscated and unreadable, but the presence of embedded URLs and the PDF-specific heuristics point towards a redirection attack. No scripts were extracted from this sample.

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.cc/pify?keyword=rudram+pdf+telugu
    • http://files.mistressmorgana.com/uploads/1/3/0/7/130739895/387d902f5709bc6.pdf
    • http://files.hrcci.org/uploads/1/3/2/6/132695572/tawofeveg_jivevoga_nezajewef_titawabam.pdf
    • http://files.mccrearykennel.com/uploads/1/3/2/6/132695339/7f3bf89af9fd.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/3100392900.pdf
    • https://cdn.shopify.com/s/files/1/0436/5497/1557/files/90844199120.pdf
    • https://cdn.shopify.com/s/files/1/0431/6486/0575/files/2441523823.pdf
    • https://cdn.shopify.com/s/files/1/0429/8424/3351/files/1282656973.pdf
    • https://cdn.shopify.com/s/files/1/0431/4847/6570/files/54641528402.pdf
    • https://cdn.shopify.com/s/files/1/0439/0649/8728/files/fativifijisizawo.pdf
    • https://cdn.shopify.com/s/files/1/0437/5016/2583/files/26016460133.pdf
    • https://cdn.shopify.com/s/files/1/0430/5915/1009/files/fogatabefadigaril.pdf
    • https://cdn.shopify.com/s/files/1/0433/5301/4423/files/25297530859.pdf
    • https://cdn.shopify.com/s/files/1/0430/6403/3429/files/paboroti.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_off000073d7.bin
83ef92877509283bdd07925eb5b24869a5937c56df7d12eb55d245ac59e94332		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73D7 4808 bytes
font_01_sfnt_off00008435.bin
77943ae0109d442c037199c5b6db7687a44d89bca379458cc0e72adc561f81a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8435 10016 bytes

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