Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf5532645791e007…

MALICIOUS

PDF

56.5 KB Created: 2020-08-05 22:58:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b83ea5b9e9a568dab0bdc612aea44cc5 SHA-1: d27baf6128f3750d3a54e5758d06dbe4ad496282 SHA-256: cf5532645791e0075de36ddfa0482e05d9d8f5d82a16f9a2c7bc3d294d43b5a0
150 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with a critical heuristic firing for a malicious redirector. The primary malicious URL, https://ttraff.ru/pify?keyword=cg+vyapam+pat+answer+key+2020+pdf, is designed to lure users by impersonating an answer key. The document body, though heavily obfuscated, contains references to this lure and other benign-looking PDF links hosted on Shopify, likely to mask the malicious intent. The ML classifier also strongly indicated maliciousness.

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=cg+vyapam+pat+answer+key+2020+pdf
    • http://files.annemariesstudio.com/uploads/1/3/1/3/131383434/pizapepiwa-numuvivewi-fakugeguwidob.pdf
    • http://files.pldmeadowlands.com/uploads/1/3/1/1/131163760/2779966.pdf
    • http://files.staylorhedgesart.com/uploads/1/3/0/7/130739214/5aac84.pdf
    • https://cdn.shopify.com/s/files/1/0433/0386/2440/files/razosupabuwomorigi.pdf
    • https://cdn.shopify.com/s/files/1/0428/7237/3411/files/gurisebumejekoxopinigij.pdf
    • https://cdn.shopify.com/s/files/1/0437/9131/9200/files/76338237063.pdf
    • https://cdn.shopify.com/s/files/1/0429/9060/0355/files/jixalemexojumomumodalut.pdf
    • https://cdn.shopify.com/s/files/1/0432/6585/1542/files/92730854416.pdf
    • https://cdn.shopify.com/s/files/1/0437/0196/0854/files/namanus.pdf
    • https://cdn.shopify.com/s/files/1/0430/9411/4457/files/pejuz.pdf
    • https://cdn.shopify.com/s/files/1/0432/7325/7116/files/36556469130.pdf
    • https://cdn.shopify.com/s/files/1/0440/8039/8486/files/rixitutuvejibedazisujoxa.pdf
    • https://cdn.shopify.com/s/files/1/0427/4647/8759/files/xeveniniwekofuz.pdf
    • https://cdn.shopify.com/s/files/1/0437/0438/5686/files/37421660536.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000662b.bin
a4d41352c67006ecba9011765108f79176bff5ae514ed799ee5c9cd9631f1b64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x662B 5824 bytes
font_01_sfnt_off00007a01.bin
7bb91423d63eb6bd7c2657278979848d60b7d38679106ec23dbd755ba6ab3d32		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7A01 2320 bytes
font_02_sfnt_off00008451.bin
ff96aa549d685367fb124fd5e560fd2aba3234e8cb05425822182dfb83a9df5f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8451 10356 bytes
font_03_sfnt_off0000a7c6.bin
5f3bf50395e8d1b65f29ab90a426c3665da69f8437ae50e88eef237d5e22552a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7C6 16224 bytes
font_04_sfnt_off0000bd4d.bin
5727467bc724f3adf6512f4031d07984dc32223b105dfdfccb7992d31f577d30		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD4D 6732 bytes

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