Malicious PDF — malware analysis report

Static analysis result for SHA-256 84bf376704cad507…

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 17:18:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 3b211da2d3d8d28c581bb80bc3a13a90 SHA-1: 16e04de271230212a549ede3b3f6dd7bcaf746a6 SHA-256: 84bf376704cad507000738a6266d0a1b5725383852112816047a173298a8026e
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/offers-to-get-free-spins-in-coin-master-game-hack PDF link annotation
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox-conins-free_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox-piece-hack_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/pubg-uc-nedir_GM1330123889.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/minecraft-java-free-account_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/www-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-get-cheats-in-roblox-jail-break_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-pubg-uc-free_GM1330123889.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/buy-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-400-spin-link-today_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/course-obstacle-2021-roblox-cheat_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox-assassin-coin-hack_GM431946152.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/coin-master-hack-apk-online_GM406889139.pdfIn PDF document text
    • https://www.skygan.com/uploaded_files/userfiles/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00002fa5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FA5 22908 bytes
SHA-256: 05a3cb17abe56d90d333951856b6292a8923af0aef3339ac84f3e935cd28ccf6
font_01_sfnt_off00006302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6302 18176 bytes
SHA-256: a5dda6ecc9550c88ef854abac2de0c7419869471da9a3b20b0ae64a03b2462f9

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