Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c4e757ea6588fd1…

MALICIOUS

PDF

42.9 KB Created: 2020-04-15 11:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4bb22288d24befcab27e14e87744a40c SHA-1: 154998b3dafecccf2de94785b7cbfaf904e4d5a5 SHA-256: 5c4e757ea6588fd1d1fd40f3ec0e4dea7f1f4409f0230ddfe684e252f32c6575
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, directing users to various websites. The document body, though partially obfuscated, contains a URL that appears to be a lure for free music, which is a common tactic for SEO spam and potentially malicious redirects. The ML classifier strongly indicated maliciousness, supporting the link farm heuristic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://livinganewwellnessctr.com/uploads/1/3/0/6/130639701/130639701.html#beethoven+symphony+no+9+free
    • http://chelseajeanblog.com/uploads/1/3/0/2/130291561/tamugo-nuxamagomenodo.pdf
    • http://bwcmedical.com/uploads/1/3/0/6/130621488/pejiruted_vilob.pdf
    • http://dwellstore.in/uploads/1/3/1/4/131437593/5392541.pdf
    • http://michaelballarddesigns.com/uploads/1/3/1/4/131453348/kitawakubeno.pdf
    • http://lpcoalition.com/uploads/1/3/0/3/130313436/noluwezilozimadize.pdf
    • http://cmthain.com/uploads/1/3/0/4/130476119/dexomewexupomijo.pdf
    • http://imsfest.com/uploads/1/3/0/5/130543059/zewebisiviviva.pdf
    • http://for3sisters.com/uploads/1/3/1/4/131455158/nipadejun.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006849.bin
944ba09a4f1e09f2641e41e855023fd400583ab64720674beda5977fd6ca5f3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6849 9124 bytes
font_01_sfnt_off00008a5d.bin
0d5d1431431a9f8dc10f3748659f3927b3f3a14b81a73ef3b8e9723c206f5964		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8A5D 16076 bytes

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