Malicious PDF — malware analysis report

Static analysis result for SHA-256 af99c0ab882115a6…

MALICIOUS

PDF

46.4 KB Created: 2021-06-08 10:54:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 96a560c9969f6d6683e771b50d9b7a1e SHA-1: 3c1ef7e505662cafe4e1559ad7887d5b89776aa3 SHA-256: af99c0ab882115a61fe52a7c88835687b5abf5b933877c5afb0719c12defaef5
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external websites, many of which are structured as SEO link farms. The document body, though heavily obfuscated, contains references to game hacks and cheat codes, suggesting a lure to download malicious content. The ML classifier strongly flagged this PDF as malicious, and the presence of a link farm indicates a potential attempt to distribute malware or lead users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/cheat-codes-for-room-roblox-game-hack
    • https://my-private-intendant.com/images/coin-master-free-spins-april-2021_GM406889139.pdf
    • https://my-private-intendant.com/images/how-to-hack-roblox-on-mobile_GM431946152.pdf
    • https://my-private-intendant.com/images/how-to-get-free-robux-generator_GM431946152.pdf
    • https://my-private-intendant.com/images/how-to-make-my-own-coin-master-cards-hack_GM406889139.pdf
    • https://my-private-intendant.com/images/minecraft-for-free-games_GM479516143.pdf
    • https://my-private-intendant.com/images/how-to-hack-a-minecraft-server_GM479516143.pdf
    • https://my-private-intendant.com/images/minecraft-pocket-edition-free-download_GM479516143.pdf
    • https://my-private-intendant.com/images/free-spins-on-coin-masters_GM406889139.pdf
    • https://my-private-intendant.com/images/boku-no-roblox-hack_GM431946152.pdf
    • https://my-private-intendant.com/images/coin-master-claim-free-spins_GM406889139.pdf
    • https://my-private-intendant.com/images/free-links-coin-master_GM406889139.pdf
    • https://my-private-intendant.com/images/free-robux-link_GM431946152.pdf
    • https://my-private-intendant.com/images/free-minecraft-worlds_GM479516143.pdf
    • https://my-private-intendant.com/images/coin-master-free-spins-link_GM406889139.pdf
    • https://my-private-intendant.com/images/free-spins-coin-master-april-2021_GM406889139.pdf
    • https://my-private-intendant.com/images/how-can-i-get-free-robux_GM431946152.pdf
    • https://my-private-intendant.com/images/coin-master-free-spins-generator_GM406889139.pdf
    • https://my-private-intendant.com/images/minecraft-free-minecraft_GM479516143.pdf
    • https://my-private-intendant.com/images/what-is-exploiting-in-roblox_GM431946152.pdf
    • https://my-private-intendant.com/images/how-can-i-get-free-spins-on-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005327.bin
50c471801d778022170227c0596a91a34f8ed8e1b8ac186689e17b35a94fc4f9
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5327 26908 bytes
font_01_sfnt_off00009156.bin
945a1a9ede9d4edce5eb026774295fca1677c420d0fd37637530d5d7ab1623ff
pdf-font-stream PDF embedded font (sfnt) at offset 0x9156 18880 bytes