Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d8d6f08a457135f…

MALICIOUS

PDF

52.3 KB Created: 2020-11-05 20:18:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5d0596be4ca8010182cbc778519c1bf5 SHA-1: e64754b22fecbd2177f8580ab76b84b6b0477627 SHA-256: 6d8d6f08a457135fe30ddbc567bea181b5149fd6371229014007f5b3b7e1e9b8
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of external links, many of which are obfuscated or lead to potentially malicious domains, as indicated by the PDF_SEO_LINK_FARM heuristic. The document body, though corrupted, contains a URL that appears to be a lure for 'nwea map scores chart 2018'. The ML classifier also strongly flagged this PDF as malicious. The presence of numerous external links suggests an attempt to redirect the user to malicious content or facilitate a phishing attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 https://trafffi.ru/aws?keyword=nwea+map+scores+chart+2018
    • https://cdn-cms.f-static.net/uploads/4386074/normal_5f9d76487622b.pdf
    • https://zalopajozi.weebly.com/uploads/1/3/1/4/131453352/c3749bd1f6.pdf
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/2890364.pdf
    • https://cdn-cms.f-static.net/uploads/4367000/normal_5f8945d17167f.pdf
    • https://cdn-cms.f-static.net/uploads/4382619/normal_5fa083453cec1.pdf
    • https://cdn-cms.f-static.net/uploads/4386594/normal_5fa410667a831.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2741603f-5dd7-4ac7-9f56-9521aefcc675/juwajisojalemuroza.pdf
    • https://uploads.strikinglycdn.com/files/2741043f-28e5-412f-bdd8-4d2687b2c79d/35728164049.pdf
    • https://s3.amazonaws.com/leguvefu/ancient_of_days_cityalight.pdf
    • https://uploads.strikinglycdn.com/files/62e4e8a3-ddb7-44e0-844e-1152fdaea565/88760940823.pdf
    • https://s3.amazonaws.com/nazekisigiduz/21286467736.pdf
    • https://s3.amazonaws.com/bezutu/54147045436.pdf
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007733.bin
580d3b2119da7a2f09650448cf856259755418258f914ba2ea140aa076d13462		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7733 2996 bytes
font_01_sfnt_off000081e0.bin
0de6f97e05120af8e36689dffdb5ca637275ec10bce8fb2a607573ea81b80e98		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81E0 5356 bytes
font_02_sfnt_off00009422.bin
991bb2d89d7dede40a278eb00df082f2ecdd91a2030abe60a2e451f2ccf852cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9422 11208 bytes
font_03_sfnt_off0000ba82.bin
72b50ce8393e6665d617349b385eb0c2ebfa959cff1463be065fa2826278273f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBA82 16076 bytes

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