Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb20bd112a5728c…

MALICIOUS

PDF

54.4 KB Created: 2021-06-11 02:14:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 056123f28a34ea99bd06149cc47b5bef SHA-1: bf30667daa7c2a9c99fe01d64fb335212a3905c9 SHA-256: bdb20bd112a5728cbd31b775e45b706511d7b1a5e44ec3f14aa60eced65fb620
162 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA and a large number of links to external PDFs, many of which are hosted on an IP address. This suggests a link farm designed to trick users into downloading malicious content, likely related to game hacking or exploits. The presence of numerous links and the fake CAPTCHA strongly indicate a malicious intent to deceive the user into clicking through to potentially harmful resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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/roblox-how-to-hack-filtering-enabled-games-game-hack
    • http://202.56.165.220/digilab/repository/best-free-hacked-client_GM479516143.pdf
    • http://202.56.165.220/digilab/repository/cute-free-hair-on-roblox_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/minecraft-reach-hack_GM479516143.pdf
    • http://202.56.165.220/digilab/repository/free-robux-games-that-actually-work_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/how-to-create-group-in-coin-master-free-spins_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/coin-master-free-spins-link-without-human-verification_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/coin-master-free-spins-and-free-coins_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/cinnamon-hair-roblox-free_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/free-spins-from-coin-master_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/coin-master-jackpot-madness-hack_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/free-spins-coin-master-haktuts_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/lua-roblox-hack_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/free-robux-generator-easy_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/coin-master-fan-page_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/coin-master-stop-attack-hack_GM406889139.pdf
    • http://202.56.165.220/digilab/repository/roblox-bloxburg-free-money-codes_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdf
    • http://202.56.165.220/digilab/repository/exploit-hack-roblox-free-download-mod-menu_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000525c.bin
c21f5f2db91d5ebc92449f0ecc7b0c526c3c42f9877e1c1ec3961944eeb8fd71
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525C 28684 bytes
font_01_sfnt_off000093ac.bin
7ebedd6b182173c8e55836cb0d114b2c4a0ac85c96a51b9f0706c935f8415fea
pdf-font-stream PDF embedded font (sfnt) at offset 0x93AC 8252 bytes
font_02_sfnt_off0000aec1.bin
b4d429af5c63499c54ee92bfc844ce98f74ccf3206430c8e133a4a07c02b3147
pdf-font-stream PDF embedded font (sfnt) at offset 0xAEC1 19456 bytes