Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cd96d35c28ee3e8…

MALICIOUS

PDF

38.5 KB Created: 2020-04-10 17:11:11 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 96dc6e728e790a7f04db2ba52841bd19 SHA-1: 57aed63f26fc73d24cc79d2d038a5f97dba0ae08 SHA-256: 3cd96d35c28ee3e84ba56466a27b4766508c9c062739bb88cae9f6d999153f14
92 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a technique commonly used in SEO spam and phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies this behavior, pointing to multiple PDF files hosted on various domains. The ML classifier also strongly indicates maliciousness. The primary intent appears to be redirecting users to a network of malicious PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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 http://peakathleticsystems.com/uploads/1/3/1/3/131383893/131383893.html#forgeworld+index+pdf
    • http://phoying.net/uploads/1/3/1/4/131454270/8255870.pdf
    • http://haus-abendsonne.org/uploads/1/3/0/6/130620343/ruxuxotawume.pdf
    • http://adalaura.com/uploads/1/3/0/2/130289338/nudelojanab_kujama.pdf
    • http://sysofblog.com/uploads/1/3/0/5/130588207/xifesuto-bovemun.pdf
    • http://hannahayraultmusic.com/uploads/1/3/0/2/130289233/bevapamenojofuvuj.pdf
    • http://ltssitedesign.com/uploads/1/3/0/6/130604109/novumizoxex.pdf
    • http://mavyryk.com/uploads/1/3/1/4/131454581/gokag-legewefava-wipobomimol.pdf
    • http://apuddeum.com/uploads/1/3/0/7/130776415/758077.pdf
    • http://peacelovemonkey.com/uploads/1/3/0/2/130288577/b8f32561c5e6772.pdf
    • http://island-therapeutics.com/uploads/1/3/0/8/130873998/3977585.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_off000064a7.bin
cd48b851fa14e2320b9329bd27e03b5bfa463fa53cbc71a3c131efa697fbbd9b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x64A7 8272 bytes
font_01_sfnt_off00008481.bin
83459e82cebe561b9e65dda6a09953c9e35f75e5df0fa62a624e1833cc5b8086		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8481 1708 bytes

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