Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7f50d9f90caee99…

MALICIOUS

PDF

36.4 KB Created: 2021-07-05 19:19:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: e1a67c903bcb960d6caef1cc425607ab SHA-1: fc6143429da32d8f1c2b4798373de41fc5667597 SHA-256: d7f50d9f90caee99a928504746d3b9a6718bc9a3916c5353c754b43e98a54e85
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links to external sites, including a primary redirector at http://netcdn.tw/app/431946152/free-robux-generator-2021-no-human-verification-or-survey-game-hack, which is flagged as malicious. The document body and heuristics indicate a lure for free Robux and game hacks, a common phishing tactic. The presence of many PDF links suggests a link farm designed to distribute malicious content or traffic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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
  • 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/431946152/free-robux-generator-2021-no-human-verification-or-survey-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-game-no-password_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux-hacks-for-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-earn-free-stars-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/its-free-real-estate-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-anything-for-free-on-roblox-2021-inspect_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/prisonbreaker16-hack-script-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hacks-para-mad-city-roblox-rock-split_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-ios-download-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/lohith-gaming-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/can-you-change-your-username-on-roblox-back-for-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-royale-high-how-to-get-free-diamonds_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/prison-breaker-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/installer-cheat-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/como-descargar-coin-master-hackeado_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
font_00_sfnt_off00003578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3578 22112 bytes
SHA-256: 4029a1833fd287fdf02f89fc78ed3d88dee6868d38d19b2a5d3dab3b2b9bd8ba
font_01_sfnt_off0000668e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x668E 20028 bytes
SHA-256: c95f599563a13a8661a8d912b5a9bb1906bac0583db2f84c1a9fc087aebca576

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