Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed72fb6c5ccccf6b…

MALICIOUS

PDF

42.8 KB Created: 2021-05-11 00:02:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 4456b1b9871013bd41677adad494e80c SHA-1: 60e13b8f2eb6a06c55431f65a06d5d70f1c1f76d SHA-256: ed72fb6c5ccccf6b470ab24bc42a8e1564936d69de360275f31485fb857c3720
180 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and lures users with themes like 'free Robux' and 'game hacks'. The document body, though partially corrupted, contains a URL that is also present in the heuristics, indicating a strong likelihood of directing users to malicious content. The presence of PDF-specific heuristics suggests exploitation of PDF vulnerabilities to execute code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-with-no-survey-game-hack In PDF document text
    • http://handimanlibrary.org/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://handimanlibrary.org/repository/blogspot-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/haktuts-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-robux-only-username_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-hack-download-2021_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/instant-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/free-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://handimanlibrary.org/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/roblox-premium-free_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
    • http://handimanlibrary.org/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://handimanlibrary.org/repository/coin-master-support_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_003_off00004a04.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A04 25064 bytes
SHA-256: af91b14380ec3786afa93e049ffc6abc4413c332f5fd682a9312f5c1ffe161e3
font_01_sfnt_off00008313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8313 18896 bytes
SHA-256: c9a06fd84da7c680e9235c6c693ba85d62e2f793adf65e6d39442d95d7fb6fc9

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