Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cdc29a631d0e7df…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 22:04:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: e6fd2ba6ae01ab597a366278e408b756 SHA-1: 0abcd8e90af723cdb0fdd5533d0cd28221f2ac7c SHA-256: 2cdc29a631d0e7dfa065cc29ba3dcb8b4d643d1e35944601fbcd884ea36330e1
102 Risk Score

Malware Insights

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

The PDF document contains numerous links to external resources, many of which are presented as 'hacks' or 'free currency' for popular games like Roblox and Coin Master. The ML classifier strongly indicates maliciousness, and the presence of a link farm heuristic suggests an attempt to distribute or redirect users to malicious content. The document body itself contains a primary URL that appears to be a lure for downloading a game hack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/roblox-games-with-free-radio-game-hack
    • https://foc.vn/public/upload/files/how-to-get-free-spins-on-coin-master_GM406889139.pdf
    • https://foc.vn/public/upload/files/hack-r-roblox_GM431946152.pdf
    • https://foc.vn/public/upload/files/coin-master-hack-apk-ios_GM406889139.pdf
    • https://foc.vn/public/upload/files/how-to-get-roblox-bucks-for-free_GM431946152.pdf
    • https://foc.vn/public/upload/files/ways-to-get-free-robux-2021_GM431946152.pdf
    • https://foc.vn/public/upload/files/coin-master-cards-hack-2021_GM406889139.pdf
    • https://foc.vn/public/upload/files/888-robux-free_GM431946152.pdf
    • https://foc.vn/public/upload/files/free-accounts-free-robux-and-obc_GM431946152.pdf
    • https://foc.vn/public/upload/files/minecraft-realms-free-codes_GM479516143.pdf
    • https://foc.vn/public/upload/files/game-test-roblox-free-bc_GM431946152.pdf
    • https://foc.vn/public/upload/files/como-hackear-el-juego-coin-master_GM406889139.pdf
    • https://foc.vn/public/upload/files/clean-master-free-coins-and-spins_GM406889139.pdf
    • https://foc.vn/public/upload/files/how-to-get-free-roblox-money_GM431946152.pdf
    • https://foc.vn/public/upload/files/free-roblox-injectors-list_GM431946152.pdf
    • https://foc.vn/public/upload/files/coin-master-hack-no-verify_GM406889139.pdf
    • https://foc.vn/public/upload/files/give-me-robux-now_GM431946152.pdf
    • https://foc.vn/public/upload/files/free-roblox-password-and-username_GM431946152.pdf
    • https://foc.vn/public/upload/files/how-to-hack-on-roblox-without-downloading-anything_GM431946152.pdf
    • https://foc.vn/public/upload/files/free-roblox-boy-hair-codes_GM431946152.pdf
    • https://foc.vn/public/upload/files/hacks-for-coin-master_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003100.bin
8e73f117a46c77809552f3459f383d7f2e4bcd1e5032804477371a14649a9c3a
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3100 23024 bytes
font_01_sfnt_off000064bc.bin
f95dd200a0d9ebe3f0c78a1b197e175e38bd8620cbfe43533c56aa3797e539ea
pdf-font-stream PDF embedded font (sfnt) at offset 0x64BC 19672 bytes