Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac6bea7bfad89923…

MALICIOUS

PDF

47.7 KB Created: 2021-06-08 10:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a3aa9751ae4f495a9feb99f1196bd533 SHA-1: 70a739043c55e6e2496a4ea7f1c32068887f998c SHA-256: ac6bea7bfad89923be2891f39dfdab545dcb861965e1c210d5bb6adb29974804
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external links, many of which point to SEO-optimized PDF files designed to attract users searching for game cheats and free items. The presence of a 'download' lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content. While no scripts were directly extracted, the PDF structure itself facilitates the redirection, likely leading to a secondary payload or phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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/free-bighead-roblox-game-hack
    • http://elektrofahrspass.de/images/free-robux-games-on-roblox_GM431946152.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-roebucks-without-verification_GM431946152.pdf
    • http://elektrofahrspass.de/images/hack-coin-master-using-cheat-engine_GM406889139.pdf
    • http://elektrofahrspass.de/images/free-minecraft-server_GM479516143.pdf
    • http://elektrofahrspass.de/images/roblox-games-free_GM431946152.pdf
    • http://elektrofahrspass.de/images/minecraft-dungeons-free_GM479516143.pdf
    • http://elektrofahrspass.de/images/links-for-coin-master-free-spins_GM406889139.pdf
    • http://elektrofahrspass.de/images/how-to-get-minecraft-java-for-free_GM479516143.pdf
    • http://elektrofahrspass.de/images/300-daily-free-spins-coin-master_GM406889139.pdf
    • http://elektrofahrspass.de/images/coin-master-free-spins-link-today-new_GM406889139.pdf
    • http://elektrofahrspass.de/images/how-to-free-robux-in-roblox-2021_GM431946152.pdf
    • http://elektrofahrspass.de/images/coin-master-link-for-spins_GM406889139.pdf
    • http://elektrofahrspass.de/images/can-i-have-robux_GM431946152.pdf
    • http://elektrofahrspass.de/images/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdf
    • http://elektrofahrspass.de/images/how-to-get-free-robux-easy-hack_GM431946152.pdf
    • http://elektrofahrspass.de/images/hacks-for-roblox-rubux_GM431946152.pdf
    • http://elektrofahrspass.de/images/coin-master-free-coins-and-spins-group_GM406889139.pdf
    • http://elektrofahrspass.de/images/coin-master-free-spins-and-coins_GM406889139.pdf
    • http://elektrofahrspass.de/images/coin-master-free-spins-link-blogspot_GM406889139.pdf
    • http://elektrofahrspass.de/images/robux-offer-wall_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004eaf.bin
726097690a2cec3b3f2de8744419fb970b1447ab438affea46416fd3cd3ce53e
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EAF 25612 bytes
font_01_sfnt_off000088c8.bin
65af76ec03203ef0114573dbbeffadad37b1cfa9f1bbe7134801072545b5c22b
pdf-font-stream PDF embedded font (sfnt) at offset 0x88C8 4016 bytes
font_02_sfnt_off000095e2.bin
5a48cd044a66cc3b4c0e068dc0930e736dbbd626ec2a32a5aecb0465d111c68a
pdf-font-stream PDF embedded font (sfnt) at offset 0x95E2 18924 bytes