Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccbf9e83e8221d5f…

MALICIOUS

PDF

35.1 KB Created: 2021-06-19 16:58:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 3650c623436395e3c5ad68e8b97ec7c8 SHA-1: d7373daa27789caad1eef9089e426d289f6d2ffc SHA-256: ccbf9e83e8221d5fcd89f927d64e13b753c04d903608d00d00ce3aacbbac88fb
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous links and a call-to-action phrase, strongly suggesting a lure for downloading a malicious application, likely related to game exploits or cheats. The ML classifier and heuristic firings confirm the malicious nature of the PDF, which hosts a large number of external links designed to redirect users to potentially harmful content. The primary IOC is the URL http://netcdn.co/app/431946152/free-robux-2021-generator-game-hack, which is likely the download location for the payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/free-robux-2021-generator-game-hack
    • https://inspiration-modellbau.de/images/google-how-do-you-get-free-robux_GM431946152.pdf
    • https://inspiration-modellbau.de/images/how-to-get-free-stuff-on-roblox-catalog-2021_GM431946152.pdf
    • https://inspiration-modellbau.de/images/how-to-get-free-robux-in-roblox-2021-no-download_GM431946152.pdf
    • https://inspiration-modellbau.de/images/free-roblox-accounts-dantdm-com_GM431946152.pdf
    • https://inspiration-modellbau.de/images/coin-master-free-coin-hack_GM406889139.pdf
    • https://inspiration-modellbau.de/images/how-to-hack-roblox-account-to-delete-them_GM431946152.pdf
    • https://inspiration-modellbau.de/images/porque-no-injecta-el-hack-roblox_GM431946152.pdf
    • https://inspiration-modellbau.de/images/how-to-download-hacks-for-roblox_GM431946152.pdf
    • https://inspiration-modellbau.de/images/free-robux-no-downloads-2021_GM431946152.pdf
    • https://inspiration-modellbau.de/images/coin-master-3rd-village-free-2021-gift-card_GM406889139.pdf
    • https://inspiration-modellbau.de/images/how-do-u-get-free-robuxs-on-mobile_GM431946152.pdf
    • https://inspiration-modellbau.de/images/roblox-free-hair-girl_GM431946152.pdf
    • https://inspiration-modellbau.de/images/free-robux-no-human-verification-no-survey_GM431946152.pdf
    • https://inspiration-modellbau.de/images/free-robux-android_GM431946152.pdf
    • https://inspiration-modellbau.de/images/como-hackear-roblox-apk-mediafire_GM431946152.pdf
    • https://inspiration-modellbau.de/images/t-t-p-s-web-roblox-com-catalog-owotshirtfree_GM431946152.pdf
    • https://inspiration-modellbau.de/images/how-to-roblox-speed-hack_GM431946152.pdf
    • https://inspiration-modellbau.de/images/2021-how-to-get-free-faces-on-roblox_GM431946152.pdf
    • https://inspiration-modellbau.de/images/www-coin-master-hack-xyz_GM406889139.pdf
    • https://inspiration-modellbau.de/images/free-robux-without-human-verification-real_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003015.bin
a9b618be02928cfe075792acd97935ac78d80a9933055a635c4a3aac4aba1b3e
pdf-font-stream PDF embedded font (sfnt) at offset 0x3015 22928 bytes
font_01_sfnt_off00006378.bin
c4a833457c3d1d625364a3586ab572f2c76932d2f7c44384205d2ed542b8cd42
pdf-font-stream PDF embedded font (sfnt) at offset 0x6378 19224 bytes