Malicious PDF — malware analysis report

Static analysis result for SHA-256 99821088e428a5cd…

MALICIOUS

PDF

44.6 KB Created: 2021-06-07 20:11:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e6050328a9ed90ffcbba2fad153d9063 SHA-1: 2f25725c4959ae095f12ba2136d82fe81a5126e2 SHA-256: 99821088e428a5cd000010adbf1716f68456683d3cf2871daba053774e3f6f8b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs that form a link farm, likely intended to direct users to malicious content disguised as game hacks. The presence of a 'download button' heuristic and the ML classifier's high confidence score further support its malicious nature. While no scripts were explicitly extracted, the PDF structure and embedded links suggest a tactic to drive users to external resources, potentially for malware delivery or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.tw/app/431946152/roblox-bloxburgh-hacks-game-hack
    • http://elektrofahrspass.de/images/can-you-get-minecraft-for-free_GM479516143.pdf
    • http://elektrofahrspass.de/images/roblox-speed-hack_GM431946152.pdf
    • http://elektrofahrspass.de/images/coin-master-daily-free-spins-blogspot_GM406889139.pdf
    • http://elektrofahrspass.de/images/free-robux-inspect-element-2021_GM431946152.pdf
    • http://elektrofahrspass.de/images/get-me-robux-for-free_GM431946152.pdf
    • http://elektrofahrspass.de/images/i-got-hacked-on-roblox_GM431946152.pdf
    • http://elektrofahrspass.de/images/www-bandicam-com-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-robux-for-free_GM431946152.pdf
    • http://elektrofahrspass.de/images/roblox-hack-game_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-do-you-get-free-daily-spins-on-coin-master_GM406889139.pdf
    • http://elektrofahrspass.de/images/minecraft-aimbot_GM479516143.pdf
    • http://elektrofahrspass.de/images/download-minecraft-java-edition-free_GM479516143.pdf
    • http://elektrofahrspass.de/images/how-to-win-free-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-to-get-minecraft-for-free-on-iphone-2021_GM479516143.pdf
    • http://elektrofahrspass.de/images/coin-master-hack-version-download-2021-ios_GM406889139.pdf
    • http://elektrofahrspass.de/images/can-you-give-me-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/free-robux-app_GM431946152.pdf
    • http://elektrofahrspass.de/images/free-spins-coin-master-app_GM406889139.pdf
    • http://elektrofahrspass.de/images/minecraft-free-reddit_GM479516143.pdf
    • http://elektrofahrspass.de/images/coin-master-free-link-facebook_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005330.bin
7c43db6d6b75385546d39c7cc6742af2b6aa8b3bb3ddf485c03e3a1aacbabcda
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5330 24112 bytes
font_01_sfnt_off00008a1e.bin
dd0cf4d9f9fadd953815afe1f03af8df622c1e18645b7500fec9f60b71bbccf6
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A1E 18776 bytes