Malicious PDF — malware analysis report

Static analysis result for SHA-256 2d5ac0ae4a42af34…

MALICIOUS

PDF

49.4 KB Created: 2020-08-09 00:30:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 033cf55b070dd5acf49cb80b63ac8e0d SHA-1: c1cc83383ee8a4bdea3532adb9cbbce245fc4335 SHA-256: 2d5ac0ae4a42af3465efc49459af839eb0a97c519fb27b308c2b8e05dec7ce7f
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to a link farm hosted on Shopify. One of these links, https://ttraff.ru/pify?keyword=estrategias+de+aprendizaje+visual+pdf, is identified as a malicious redirector. The document body, though heavily obfuscated, contains references to the same URLs found in the link farm. This suggests the PDF is designed to redirect users to malicious sites under the guise of providing learning resources.

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=estrategias+de+aprendizaje+visual+pdf
    • http://files.alleyt.net/uploads/1/3/2/7/132740285/rutuperomuda.pdf
    • http://files.ucsbaccounting.com/uploads/1/3/0/8/130813366/zokas.pdf
    • http://files.cardenarborview.org/uploads/1/3/0/8/130874125/bulimegefotevo.pdf
    • https://cdn.shopify.com/s/files/1/0433/5036/0232/files/doruni.pdf
    • https://cdn.shopify.com/s/files/1/0427/9504/0924/files/emergency_endodontic_treatment.pdf
    • https://cdn.shopify.com/s/files/1/0434/2172/8930/files/90203193600.pdf
    • https://cdn.shopify.com/s/files/1/0430/3477/1610/files/57695635525.pdf
    • https://cdn.shopify.com/s/files/1/0430/5901/9933/files/davis_drug_guide_amiodarone.pdf
    • https://cdn.shopify.com/s/files/1/0432/0244/5475/files/71104614471.pdf
    • https://cdn.shopify.com/s/files/1/0429/7061/1861/files/23461286793.pdf
    • https://cdn.shopify.com/s/files/1/0435/2914/2426/files/wuxok.pdf
    • https://cdn.shopify.com/s/files/1/0438/1474/8322/files/vaxugivogakavekote.pdf
    • https://cdn.shopify.com/s/files/1/0435/7364/1379/files/hotel_bill_format_in.pdf
    • https://cdn.shopify.com/s/files/1/0432/3573/7764/files/67780876970.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_off00007254.bin
bd6cf025132367c86d137f4b3b4c70b6d9b7f3e760d59a08babbfac43ae98e1d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7254 5124 bytes
font_01_sfnt_off000083dd.bin
f4a4543b3fab1a9102f847dc59e42adbbee1233d783de08d81fbc70595ff1bbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83DD 11424 bytes
font_02_sfnt_off0000a8e5.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA8E5 4324 bytes

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