Malicious PDF — malware analysis report

Static analysis result for SHA-256 8cd4c4766b7dbca8…

MALICIOUS

PDF

38.8 KB Created: 2020-04-10 15:45:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 22ea4cb70ed4c9630a3d3599e054acb5 SHA-1: 04781cfcb85afa91d35f6f07263a54f2ad77cca1 SHA-256: 8cd4c4766b7dbca8a2fa26dd4d7673c7f308feddc466d787c6cd00ea930e3575
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, indicating a link farm or distribution network. The ML classifier strongly flagged this PDF as malicious. The primary attack pattern involves directing users to these external resources, likely to serve malicious content or for SEO manipulation.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://ewealtharena.org/uploads/1/3/0/5/130589399/130589399.html#abandonment+recovery+workbook+pdf+free
    • http://kazandkate.com/uploads/1/3/0/2/130289236/6146893.pdf
    • http://flmp.us/uploads/1/3/0/7/130775013/rexirafifanizas.pdf
    • http://pophealth.io/uploads/1/3/0/5/130544090/df97b41d52c7b.pdf
    • http://totalkidsparty.com/uploads/1/3/0/7/130776413/sopufe.pdf
    • http://mymainelydeals.com/uploads/1/3/1/6/131606578/fukenije-tebawel-dusero.pdf
    • http://midcenturymemories.com/uploads/1/3/0/5/130539059/39b1e03deaa0.pdf
    • http://jolenesphotography.com/uploads/1/3/0/7/130738507/jadewodagepotu.pdf
    • http://futbol-tips.com/uploads/1/3/1/4/131438162/324828.pdf
    • http://lashblab.com/uploads/1/3/0/5/130542870/7647744.pdf
    • http://divasdoingbusiness.com/uploads/1/3/1/4/131482939/4384642.pdf
    • http://defensecolorado.us/uploads/1/3/0/7/130776452/5748740.pdf
    • http://gearfitnessabq.com/uploads/1/3/1/3/131380273/wiginowifebanerunu.pdf
    • http://alaqarmall.com/uploads/1/3/0/5/130544232/2dbc5594fc8.pdf
    • http://texas-trio.com/uploads/1/3/0/4/130483844/6959137.pdf
    • http://affinityseize.com/uploads/1/3/0/5/130551143/f989fbe1107ca05.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_off00006fa9.bin
6c32b6aad85176d94f9c52f1eeb95f4ca52cc46a0b870c4c9d4a7848f70f069d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6FA9 7808 bytes

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