Malicious PDF — malware analysis report

Static analysis result for SHA-256 b55c017995830c78…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 21:11:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6986ab056d867a4d7344fe14f0b99f4c SHA-1: 12f77d65cd11cddfabe0b5c4574e62fc39bb6d2e SHA-256: b55c017995830c788ad830ca2cd005e1110cb2fd72b91c8d49ffa219aebda8df
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. 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 5

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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-free-spins-link-no-verification-2021-game-hack PDF link annotation
    • http://lib.kesdammedan.ac.id//repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-rape_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/get-me-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/free-robux-only-username-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-spins-coin-master-daily_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-retail-tycoon-money-hack-2021-on-mac_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/minecraft-free-demo_GM479516143.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/how-to-get-lots-of-robux-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/robux-hack-generator-secret-roblox-hack-revealed_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-epic-mining-2-cheats_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-hack-2021-download-free_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id//repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/rbxcash-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/roblox-cheats-how-to-get-free-obc_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://lib.kesdammedan.ac.id/repository/minecraft-pvp-hacks_GM479516143.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
font_00_sfnt_off00003205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3205 22980 bytes
SHA-256: 22673ae51122236470984a3e30530395f57de03a01bb3dd525ef8c242cc23072
font_01_sfnt_off000065bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65BB 18880 bytes
SHA-256: 959a402348cf5c915c560357ecab6e8019ade4de046d620f98c663afb78237ce

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