Malicious PDF — malware analysis report

Static analysis result for SHA-256 dd9c1d4274dc8577…

MALICIOUS

PDF

35.9 KB Created: 2020-06-09 06:40:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a4287942a7ec2933eb1ecb68d7ea859e SHA-1: 4b71ff78d994e7599dc69c12f6b6ffeb7a9df1a6 SHA-256: dd9c1d4274dc85770e8a02afcf9990ba38796815489ba9eea4c86253a06dd55b
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. The document body text and extracted URLs suggest a lure related to book downloads, specifically 'As crônicas de gelo e fogo'. The primary intent appears to be directing users to a network of linked PDF files hosted on various domains, likely as a distribution mechanism for further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://gamechangeralliance.com/uploads/1/3/1/3/131383646/131383646.html#as+cr%25C3%25B4nicas+de+gelo+e+fogo+livro+3+pdf
    • http://juliana-dunn.org/uploads/1/3/1/4/131438190/2525b003448.pdf
    • http://bechronicallyempowered.com/uploads/1/3/1/4/131454459/jetijesiko.pdf
    • http://hostmaster.bumblecampers.com/uploads/1/3/0/6/130639656/1088602.pdf
    • http://mta-sts.mail.etoilechavilleyoga.com/uploads/1/3/0/4/130475992/4442426.pdf
    • https://zisoliw.files.wordpress.com/2020/06/befofodinaluvugibu.pdf
    • https://kovelika628460905.files.wordpress.com/2020/06/rawew.pdf
    • https://zemijedo.files.wordpress.com/2020/06/46763902913.pdf
    • https://revepogalonu.files.wordpress.com/2020/06/26124975253.pdf
    • https://zexekiko.files.wordpress.com/2020/06/papapimapobisekurizip.pdf
    • https://dasawiduved.files.wordpress.com/2020/06/juwebanojime.pdf
    • https://badiwilam.files.wordpress.com/2020/06/fozususoxevesepiwa.pdf
    • https://zifenopi.files.wordpress.com/2020/06/pavifasajukusewe.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005ea1.bin
8a6c94e26cf10065a44cb5ec2c8fc7d2bec6ed05b424a7ed26a4fdf6d29c02e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EA1 11536 bytes

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