Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c56a3f5169df72f…

MALICIOUS

PDF

45.0 KB Created: 2021-06-08 21:01:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: c481869a1dfe4d2c5d83b4a75c5be000 SHA-1: 9b5b4b8e220f8841ad4d29fede76daad652adcb2 SHA-256: 1c56a3f5169df72f37a68648f7accfb2da5da871f274b17fd4ffbc7170aa1c2b
102 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which appear to be part of a link farm designed to drive traffic to specific content, such as game hacks and free spins. The ML classifier strongly indicated maliciousness, and the presence of a download button lure further supports a malicious intent. The primary goal appears to be directing users to potentially harmful external sites.

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/how-to-hack-a-megavore-in-dino-sim-roblox-game-hack
    • http://digilib.akbidarrahma.ac.id/repository/spin-and-coin-link_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/how-to-get-real-robux_GM431946152.pdf
    • http://digilib.akbidarrahma.ac.id/repository/free-spins-coin-master-generator_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-50-spin-link_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/where-to-get-free-robux_GM431946152.pdf
    • http://digilib.akbidarrahma.ac.id/repository/free-coins-for-planet-master-game_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://digilib.akbidarrahma.ac.id/repository/free-spins-for-coin-masters_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-pc-hack-tool_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/free-coin-master-spins-and-coins_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/free-spin-today-coin-master_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/robux-survey_GM431946152.pdf
    • http://digilib.akbidarrahma.ac.id/repository/roblox-royale-high-diamond-hack_GM431946152.pdf
    • http://digilib.akbidarrahma.ac.id/repository/minecraft-free-school_GM479516143.pdf
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-free-spins-and-coins-daily_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/minecraft-reach-hack_GM479516143.pdf
    • http://digilib.akbidarrahma.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdf
    • http://digilib.akbidarrahma.ac.id/repository/roblox-shirt-template-free_GM431946152.pdf
    • http://digilib.akbidarrahma.ac.id/repository/coin-master-free-coins-cheat_GM406889139.pdf
    • http://digilib.akbidarrahma.ac.id/repository/get-free-robux-com_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000050d9.bin
7e6cc5c2ee631fff387a8f628007e70987bdb238801f019b0c448d7100cffb6d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50D9 24668 bytes
font_01_sfnt_off000089b4.bin
ef9642a9d4b60566b88ec87ac323786b4a571cfb27cf556ee503548cf0bcc33d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89B4 19492 bytes

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