Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90e0a6e21a8f354…

MALICIOUS

PDF

54.0 KB Created: 2021-06-11 06:24:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 1e43f7776ab6520a4376721ffcb97eba SHA-1: aa401b610adf26d49cb7284db3f554c39b7aa408 SHA-256: f90e0a6e21a8f35469297d3cc4fde1d9ef39156bc501041c929d0ee12f175189
82 Risk Score

Malware Insights

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

The PDF document contains multiple embedded URLs and a lure related to obtaining free in-game items, suggesting a phishing or scam attempt. The heuristic for a password-protected archive handoff indicates that the user is likely instructed to download a password-protected file, which is a common tactic to bypass security filters. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

Heuristics 4

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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-roblox-accounts-with-obc-2021-game-hack
    • http://ghhs.com.my/images/how-to-get-free-robux-promo-codes_GM431946152.pdf
    • http://ghhs.com.my/images/how-to-get-free-robux-on-mobile_GM431946152.pdf
    • http://ghhs.com.my/images/free-spin-link-for-coin-master-game_GM406889139.pdf
    • http://ghhs.com.my/images/free-clothes-promo-codes-roblox_GM431946152.pdf
    • http://ghhs.com.my/images/how-to-get-free-robux-without-paying_GM431946152.pdf
    • http://ghhs.com.my/images/free-robux-android_GM431946152.pdf
    • http://ghhs.com.my/images/how-to-get-free-coins-in-minecraft_GM479516143.pdf
    • http://ghhs.com.my/images/free-coin-master-spins-2021_GM406889139.pdf
    • http://ghhs.com.my/images/free-spins-link-in-coin-master-2021_GM406889139.pdf
    • http://ghhs.com.my/images/minecraft-windows-10-hacked-client_GM479516143.pdf
    • http://ghhs.com.my/images/free-tiktok-followers-without-downloading-apps_GM835599320.pdf
    • http://ghhs.com.my/images/roblox-free-robux-com_GM431946152.pdf
    • http://ghhs.com.my/images/free-coin-master-links_GM406889139.pdf
    • http://ghhs.com.my/images/free-robux-giveiaway-live_GM431946152.pdf
    • http://ghhs.com.my/images/free-tiktok-followers-no-survey-or-verification_GM835599320.pdf
    • http://ghhs.com.my/images/2021-free-coin-master-spins_GM406889139.pdf
    • http://ghhs.com.my/images/free-injector-roblox_GM431946152.pdf
    • http://ghhs.com.my/images/free-robux-without-verification_GM431946152.pdf
    • http://ghhs.com.my/images/free-roblox-passwords_GM431946152.pdf
    • http://ghhs.com.my/images/free-robux-no-password_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051d9.bin
51d196b4ddd22aea7c49c6541b0dfed19cf119c7d4d6d38353db34f14c059e9c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51D9 27076 bytes
font_01_sfnt_off00009237.bin
ddfd86c88a6b8304bc31eeb9f28c8110fac325cdacc87503bacf4ac741777490		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9237 8704 bytes
font_02_sfnt_off0000aea2.bin
ce31fe63dba85b9e50a4b107f7699f4ccb14fb78fa7cd7067f6a197abace08b1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAEA2 19076 bytes

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