Malicious PDF — malware analysis report

Static analysis result for SHA-256 031a414196911f9b…

MALICIOUS

PDF

40.0 KB Created: 2021-05-15 05:00:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 6106e54053f3e9977a161f1147e08bf3 SHA-1: ca566436a462e072023b295b063ae236753e0f96 SHA-256: 031a414196911f9b9fa3f801c2c42c57fc83af6065c3cb721ca80dd4544f25a3
102 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, forming a link farm. These links predominantly lead to other PDF documents hosted on similar domains, often with SEO-optimized titles related to game hacks and cheats. This suggests a campaign to drive traffic to potentially malicious download sites, masquerading as helpful resources. The presence of a "download button" heuristic further supports the lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://netcdn.xyz/app/406889139/coin-master-hack-ios-apk-game-hack
    • http://iacfhouston.com/images/coin-master-free-spins-link-whatsapp-group_GM406889139.pdf
    • http://iacfhouston.com/images/coin-master-free-spins-for-iphone_GM406889139.pdf
    • http://iacfhouston.com/images/free-roblox-dominus_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-hack-no-survey_GM406889139.pdf
    • http://iacfhouston.com/images/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-free-spins-link-2021_GM406889139.pdf
    • http://iacfhouston.com/images/games-that-give-you-free-robux_GM431946152.pdf
    • http://iacfhouston.com/images/rbl-gg-free-robux_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-hack-tool_GM406889139.pdf
    • http://iacfhouston.com/images/moon-static-coin-master-generator-hacks-free_GM406889139.pdf
    • http://iacfhouston.com/images/coin-master-hack-mod-apk-35-8_GM406889139.pdf
    • http://iacfhouston.com/images/apps-for-free-robux_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdf
    • http://iacfhouston.com/images/coin-master-game-hack-apk_GM406889139.pdf
    • http://iacfhouston.com/images/roblox-premium-free_GM431946152.pdf
    • http://iacfhouston.com/images/coin-master-village-4_GM406889139.pdf
    • http://iacfhouston.com/images/promo-codes-to-get-free-robux_GM431946152.pdf
    • http://iacfhouston.com/images/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://iacfhouston.com/images/www-rbx-com_GM431946152.pdf
    • http://iacfhouston.com/images/free-robux-generator-com-roblox-hack_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004397.bin
b5d1b6b6471ca4f003c07c0f391531570d6381a48566cb54b43133788b5c9883
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4397 24184 bytes
font_01_sfnt_off00007ade.bin
c18f05485291fd9dd2d982fa815b69c2a1f9afc9df9b250f8ccfc4cbb8514acf
pdf-font-stream PDF embedded font (sfnt) at offset 0x7ADE 17892 bytes