Malicious PDF — malware analysis report

Static analysis result for SHA-256 97d9d15eb049aa9a…

MALICIOUS

PDF

44.7 KB Created: 2021-05-12 18:34:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: dffab856bd64c934190a24f1b998f9c6 SHA-1: 7620d412babc3c8520454ba2b7123eaa4c7c7c74 SHA-256: 97d9d15eb049aa9a3e29fe2359adcad9726e5a7b7d159b373546147034b71e13
102 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering 'free spins' or 'hacks' for games like Coin Master and Roblox. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent, likely to direct users to scam websites or download further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

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.xyz/app/406889139/100-free-spins-coin-master-link-game-hack
    • https://www.hobbypcb.com/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdf
    • https://www.hobbypcb.com/images/coin-master-free-cards-link_GM406889139.pdf
    • https://www.hobbypcb.com/images/coin-master-free-spins-daily-2021_GM406889139.pdf
    • https://www.hobbypcb.com/images/free-daily-spins-coin-master_GM406889139.pdf
    • https://www.hobbypcb.com/images/roblox-april-fools-hack_GM431946152.pdf
    • https://www.hobbypcb.com/images/roblox-game-free-download_GM431946152.pdf
    • https://www.hobbypcb.com/images/coin-master-free-cards-2021_GM406889139.pdf
    • https://www.hobbypcb.com/images/how-to-get-free-followers-on-roblox_GM431946152.pdf
    • https://www.hobbypcb.com/images/how-to-hack-coin-master-game-without-verification_GM406889139.pdf
    • https://www.hobbypcb.com/images/coin-master-cards-free-cards_GM406889139.pdf
    • https://www.hobbypcb.com/images/coin-master-hack-dot-xyz_GM406889139.pdf
    • https://www.hobbypcb.com/images/minecraft-pe-apk_GM479516143.pdf
    • https://www.hobbypcb.com/images/how-to-get-java-minecraft-free_GM479516143.pdf
    • https://www.hobbypcb.com/images/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • https://www.hobbypcb.com/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdf
    • https://www.hobbypcb.com/images/how-to-get-free-robux-com_GM431946152.pdf
    • https://www.hobbypcb.com/images/www-claim-gg-to-earn-free-robux_GM431946152.pdf
    • https://www.hobbypcb.com/images/coin-master-free-coins-and-spins-today_GM406889139.pdf
    • https://www.hobbypcb.com/images/minecraft-free-ios-2021_GM479516143.pdf
    • https://www.hobbypcb.com/images/coin-master-hack-ios-10_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004b81.bin
153fad17a119eabe1d55670cedeebf23f097ade4773f0329a4b3dabc50a39234
pdf-font-stream PDF embedded font (sfnt) at offset 0x4B81 24252 bytes
font_01_sfnt_off00008278.bin
3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
pdf-font-stream PDF embedded font (sfnt) at offset 0x8278 2840 bytes
font_02_sfnt_off00008c2a.bin
9c7d71bf4653e82f34779ff687ecc32abef763f146c991042409a9b1562a78ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x8C2A 18336 bytes