Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4a63d2b4fb1faff…

MALICIOUS

PDF

37.1 KB Created: 2020-05-08 04:41:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b22cd296be000bd92d0458f66cb4c613 SHA-1: 559579142e8eb751b38c38d342115607f3520da4 SHA-256: e4a63d2b4fb1faffbf79dcd0930546d6a8f5721179664de5017db77dbca83b82
92 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted across various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the observed link farm pattern. No scripts were extracted, limiting the analysis of direct payload execution.

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://usemybitcoins.com/uploads/1/3/0/8/130874489/130874489.html#a+horse+and+two+goats+answers
    • http://kaiserair.us/uploads/1/3/0/4/130489567/gozuw_xomidurepafir_vobavajamuj.pdf
    • http://jaydenwatters.com/uploads/1/3/0/6/130604342/jazekozob.pdf
    • http://contractorsdashboard.com/uploads/1/3/0/6/130621501/balexefova.pdf
    • http://hedemeisehen.com/uploads/1/3/1/3/131379202/692e746.pdf
    • http://midwesthomehealthstl.com/uploads/1/3/0/6/130621109/4559386.pdf
    • http://fluencybuilders.net/uploads/1/3/0/4/130435939/bajuripiruv.pdf
    • http://jayelando.com/uploads/1/3/1/3/131383766/zogosuxeke.pdf
    • http://rancinternational.com/uploads/1/3/0/6/130621713/ruvenotoxogukuwaxuv.pdf
    • http://sherwoodparkpianolessons.com/uploads/1/3/0/6/130621727/1685210.pdf
    • http://positiverepaymentservicing.com/uploads/1/3/1/3/131383599/sinifiguketibuvenam.pdf
    • http://optimaltechnologies.net/uploads/1/3/0/5/130538816/8375879.pdf
    • http://capitaljunkie.com/uploads/1/3/0/7/130776854/9e7a455e.pdf
    • http://analyticlabworks.com/uploads/1/3/1/4/131407704/pudodonasop-lubeta-kevewog.pdf
    • http://prestovirtuals.com/uploads/1/3/0/2/130289543/puvibimojuxuji.pdf
    • http://mahaservice.net/uploads/1/3/0/2/130287845/wujetugafogaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • 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_off00006637.bin
3a9212c3ccfa18260c2900ac0a56127060968338f611c6373bb559a79aadd5b4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6637 10600 bytes

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