Malicious PDF — malware analysis report

Static analysis result for SHA-256 91bb437df86b3de2…

MALICIOUS

PDF

43.0 KB Created: 2020-08-23 17:44:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34d4c729ab716002585ff546a4e93b6 SHA-1: b8b29467cef1b0abd91e5e86e5aad8c241ee5a8d SHA-256: 91bb437df86b3de21a2dcd89102ec007bb693c6770e30930b3d20553ad6699ed
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Addends T1059.001 PowerShell

The PDF contains numerous links to external resources, a common tactic for SEO link farms and redirecting users to malicious sites. The heuristic 'PDF_MALICIOUS_REDIRECTOR_LINK' specifically flags a URL pointing to 'ttraff.com', indicating a malicious redirector. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains the same suspicious URL, reinforcing the attack pattern.

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=link%2527+s+awakening+switch+seashells+guide
    • http://files.nativecallings.com/uploads/1/3/1/6/131607062/3873588.pdf
    • http://suxarimuz.skindreams.net/uploads/1/3/1/4/131406390/nofaxupudefora_xokez.pdf
    • http://bufarano.alliancetransfer.com/uploads/1/3/1/3/131380429/pefekijoru.pdf
    • http://files.theidahowrestler.com/uploads/1/3/0/8/130874217/6503919.pdf
    • http://files.supportingsuperstudents.org/uploads/1/3/2/7/132741241/22b523.pdf
    • https://cdn.shopify.com/s/files/1/0430/8333/3799/files/xivajurowipaselaxakixe.pdf
    • https://cdn.shopify.com/s/files/1/0434/9480/1568/files/fumosolutejatozijudusi.pdf
    • https://cdn.shopify.com/s/files/1/0430/8644/6746/files/41627120969.pdf
    • https://cdn.shopify.com/s/files/1/0430/0849/1673/files/nilezuv.pdf
    • https://cdn.shopify.com/s/files/1/0435/5457/0399/files/nulujiwulenanofozitejomo.pdf
    • https://cdn.shopify.com/s/files/1/0440/1650/0886/files/define_immersed_transformer.pdf
    • https://cdn.shopify.com/s/files/1/0430/7327/4018/files/felazozaminas.pdf
    • https://cdn.shopify.com/s/files/1/0434/6249/2313/files/gilolu.pdf
    • https://cdn.shopify.com/s/files/1/0431/9671/1073/files/75372831206.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_off00005e7a.bin
3289f76839c8e8dbce68f2f8e0812a58faf0aa1829792dd18a90f3450a3bdb85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E7A 5008 bytes
font_01_sfnt_off00006f8c.bin
20ed2589acb76645d7d7e6d175675e3bed527b7b3ab21ed9085c3ca98b195111		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6F8C 9752 bytes
font_02_sfnt_off000090dc.bin
d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90DC 4324 bytes

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