Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c2178adc5dbb4a3…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 23:38:49 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bf29f2a6d3bc8792ee6e5aea612c215e SHA-1: c1a7e85ce25ebc5ba72db38e24c2e61a364ca0c8 SHA-256: 7c2178adc5dbb4a332185486acefd135854ffee20ee4f457a6792a5936756789
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a malicious website, identified as a 'free generator / game hack' lure. The ML classifier strongly indicated maliciousness, and the presence of numerous redirector links confirms a malicious intent to lead users to potentially harmful content. No scripts were extracted, but the document's structure and embedded URLs point to a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 4

  • 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.
  • 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.online/app/431946152/flame-gg-free-robux-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-scams_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-golden-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-cheat-engine-rs_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-windows-10-hack-client-2021_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/i-need-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-tiktok-followers-no-human-verification-or-survey_GM835599320.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-app-store-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/instant-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-no-generator_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000051a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A1 24244 bytes
SHA-256: 476ea75288a30c38e3687cd93066a36b69304d5a89e4306d6dbd055cfeef5b93
font_01_sfnt_off00008941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8941 2852 bytes
SHA-256: 6c344bff8cb11efcfa323542d02369dac514041cc19c9a49b1052cb126dcbdcf
font_02_sfnt_off00009302.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9302 18864 bytes
SHA-256: a12d67d537c0c2cb89f37f7f05ea7de5b6c0986bd532439e1b20da8093887b01

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