Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3216afb51eb224e…

MALICIOUS

PDF

34.1 KB Created: 2021-07-06 06:41:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 41668287a6dfad787fe7843402071720 SHA-1: 706e39e232502e050f29b94475e7ac5cf3527a7e SHA-256: a3216afb51eb224e23bdd2af4ee233ce2bc1a675d3faecb014a22d48b78c460a
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • 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/406889139/coin-master-hack-apk-ios-game-hack PDF link annotation
    • http://oca.undil.tl/repository/free-games-like-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-and-coins-app-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-look-like-a-hacker-in-roblox-with-rubux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/2021-no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/no-cool-down-hack-roblox-sword-burst-online-mac_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-free-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/hack-coins-pizzeria-roleplay-remastered-roblox-v3rmillion_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-jailbreak-hack-fr_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/pubg-uc-20219_GM1330123889.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-human-verification-android_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-accessories-for-free_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-account-generator_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/real-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-daily-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-mcpe-master-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002e55.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2E55 23296 bytes
SHA-256: c60e21361cfbc6b72a26fd1e067747aa51572c0753d45fde6e52fde586f6197d
font_01_sfnt_off000062fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FE 18180 bytes
SHA-256: 669191ced257cad8cf719fd096a029eb32cc90bb1eacba4ce7ed61202962bed4

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