Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a081ff593b4cac5…

MALICIOUS

PDF

47.9 KB Created: 2021-06-03 14:14:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 452781b48f86df71d77a5878d16536eb SHA-1: 2b3986a43b082c5284a862a9f7adfce978c14856 SHA-256: 3a081ff593b4cac50b5e36ddeecfa5b19fbcd170a273be24da20388304f1a3a0
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a lure for a 'free generator / game hack' which is a common social engineering tactic to trick users into clicking malicious links. The embedded URL points to a site offering such a generator, likely leading to malware download or further exploitation. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 6

  • 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.
  • 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
  • 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 https://netcdn.online/app/431946152/roblox-shirt-template-free-game-hack PDF link annotation
    • http://library.futureuniversity.com/repository/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/minecraft-server-hacks_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-tiktok-likes-without-verification_GM835599320.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/cm-free-spin-link-today_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-earn_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/is-minecraft-free-on-ps4_GM479516143.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.futureuniversity.com/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.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_004_off0000515a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x515A 30988 bytes
SHA-256: 7e4f00fceec4e983ae3ea8f79772065cabc178ec47de11293d6b988217622ef5
font_01_sfnt_off000096e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x96E0 19000 bytes
SHA-256: d6f805bdffd03661be01a04ac852086d1abcf91b3aa9c1742de675ba95b2394a

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