Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1aea3b86b5ed5c8…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 04:27:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 86f7f9918f68c9e3259528f4372dcd42 SHA-1: f24445f0baaf83aec879130f90fb50be6678fb0a SHA-256: f1aea3b86b5ed5c88ca164b0c5d12474717e3e468c21693bd39a5bca699f5286
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector, disguised as a game hack generator. The ML classifier also flagged this PDF as malicious. The embedded links likely lead to a second-stage download or phishing page, attempting to exploit user interest in free game items or cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/406889139/how-many-levels-in-coin-master-game-hack In PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-java-edition-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/dantdm-gave-me-free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/appsmobinfo-coinmasterhack-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-hack-2021_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/is-there-a-free-version-of-minecraft_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/roblox-re_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://library.atim.ac.id/repository/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-free-lives-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-daily-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/get-free-robux-info_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/robux-sign_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://library.atim.ac.id/repository/coin-master-hack-app_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_off00005015.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5015 26132 bytes
SHA-256: 0c623bad608b8d6dfd05846f061828baeb798a5d5ff64f404fbe94b5e6b90535
font_01_sfnt_off000089ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89FF 18076 bytes
SHA-256: 99893503d576b54c6a7779c175b2bfa9d44389b8fa70f32573e8e1493170e333

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