Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdf916851cd0de30…

MALICIOUS

PDF

46.9 KB Created: 2021-06-03 06:57:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 03ae7bc1c11ec1caaf52c2bda77562a3 SHA-1: afe5c7347cbde3ec99b058e14a89346ce128ab0b SHA-256: fdf916851cd0de308e3925356765fa86ecf8d033e4144274d61a268acee165a0
142 Risk Score

Malware Insights

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

The PDF document contains lures related to "free generators / game hacks" and impersonates PayPal, directing users to a suspicious URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely for credential phishing or to download a second-stage payload. No scripts were extracted, but the document structure and embedded URLs strongly suggest a phishing or malware delivery attempt.

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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.online/app/431946152/how-to-make-a-private-server-on-roblox-for-free-game-hack.
  • 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/how-to-make-a-private-server-on-roblox-for-free-game-hack PDF link annotation
    • https://opac.umrah.ac.id/repository/free-roblox-clothes-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spin-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spin-sites-for-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/tiktok-free-fans_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-minecraft-realms-for-free_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-cheat-codes_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/best-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/hacks-for-coin-master-game_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_off00005045.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5045 28492 bytes
SHA-256: 34e415a85751dd8932433b8ba93a9c8fa909c79f3d158e75f3a72aac261c6d1f
font_01_sfnt_off00009233.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9233 19196 bytes
SHA-256: b86313febfc454b426d55667776bc2f57fbcac051d8b12890de5d5336413d825

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