Malicious PDF — malware analysis report

Static analysis result for SHA-256 692c9680e38b876e…

MALICIOUS

PDF

33.5 KB Created: 2021-07-06 13:54:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 923c8d194aa7d911629dbe65ef3e1ed3 SHA-1: 69e302cf893b2af114540e8490b674859399a5e5 SHA-256: 692c9680e38b876e45836daecb629059933f4c47e0fabf0fcc68f8693b004130
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising free Robux and game hacks. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malicious content or downloads. While no scripts were explicitly extracted, the nature of the links and the lure suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • 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/how-to-make-free-robux-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-java-account_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/granny-roblox-free-money-pro-hacks_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-automicattley_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-roblox-servers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/best-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/stock-speed-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-severs_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-dominus_GM431946152.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_off00002ab5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AB5 22716 bytes
SHA-256: 870308a0ac71734d60fee8afe9f7e073fcdfed392c417d73bebaacddc7c5e8af
font_01_sfnt_off00005da1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DA1 19244 bytes
SHA-256: 6b22af1083df9260d35a8428a36ac91eb4c7dbc1159f4e02fe88489ba0efcc00

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