Malicious PDF — malware analysis report

Static analysis result for SHA-256 923effc79da252ed…

MALICIOUS

PDF

35.2 KB Created: 2020-06-12 04:43:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f54f9baf3039e5e4f9404b18bf477b34 SHA-1: 74468fd30b2f789e74904a4c781612a334099bce SHA-256: 923effc79da252edfd95a8626314a0a522b114b2c5c8b27e7ca4900bbfae06d3
94 Risk Score

Malware Insights

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

The PDF document contains a lure related to 'Best Buy coupons' and embeds numerous external links, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract traffic or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, but the presence of a link farm and the deceptive document content strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://leisure-charters.com/uploads/1/3/1/6/131637409/131637409.html#best+buy+coupon+pdf
    • http://rhkeeper.com/uploads/1/3/1/3/131382942/2f7e8ce5.pdf
    • http://grandparentguide.net/uploads/1/3/0/4/130435536/gudatixinipuzoj.pdf
    • http://iicforsuccess.org/uploads/1/3/1/4/131407945/4177897.pdf
    • http://orchardshutters.eu/uploads/1/3/0/6/130604382/zisepibaxirebazo.pdf
    • https://tejunif.files.wordpress.com/2020/06/mirefab.pdf
    • https://vofewutuwoge.files.wordpress.com/2020/06/ketarovew.pdf
    • https://wupefosa.files.wordpress.com/2020/06/biwesejoborilunoro.pdf
    • https://pavofozib.files.wordpress.com/2020/06/503740983.pdf
    • https://pobexegol.files.wordpress.com/2020/06/30529681372.pdf
    • https://disepufax.files.wordpress.com/2020/06/3447837606.pdf
    • https://ditilepikap.files.wordpress.com/2020/06/96670519847.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_off00005b3f.bin
d87089e3fe3d791a0543ee2b0229dcd8ffa16f9b9ca44b189570213f63dff3c7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5B3F 11432 bytes

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