Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c5fe2367e54f4e6…

MALICIOUS

PDF

41.7 KB Created: 2020-04-10 13:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2738f85b004fd60b717857c76896507 SHA-1: dfe3f004414aa6dfbf8b892eeb8bb0bc1fdf4d23 SHA-256: 4c5fe2367e54f4e6bd2aaf2d0b403bdcba49f6f3cb166e0cae668b7c47185f88
94 Risk Score

Malware Insights

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

The PDF document contains a deceptive title related to math problems, but its primary function is to act as a link farm. It directs users to a large number of external PDF files hosted on various domains, indicating a potential distribution or redirection mechanism for malicious content. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://andrewslawncare.org/uploads/1/3/1/6/131637171/131637171.html#rate+of+change+word+problems
    • http://christopherroyer.com/uploads/1/3/0/2/130272388/1d857e5346788d.pdf
    • http://endorsedbyheaven.com/uploads/1/3/0/2/130272862/sovagev-xizil.pdf
    • http://missiond.org/uploads/1/3/1/3/131397950/xojotibiz-gilibanug-lufetesixeg.pdf
    • http://wealthtacos.com/uploads/1/3/0/5/130589299/pibupugonino_gadagefuwiduka_zibaj_kukur.pdf
    • http://austinunderwood.com/uploads/1/3/1/4/131483445/nebovokuxizuz.pdf
    • http://tonyboer.com/uploads/1/3/1/4/131406698/1703579.pdf
    • http://marinerescuekioloa.com/uploads/1/3/0/4/130436244/159e9aedb63bfe.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_off000070dd.bin
9e109f18f18df8addb5693658fee77fd499a81912cfc0ef1bf435606cba1fb20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 8212 bytes
font_01_sfnt_off000090d4.bin
1ec5e4369fa4295c2cd6b0b3a1791cabbbdecd5398ecc7ca77fac8fc27e625d5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90D4 2612 bytes

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