Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a9bb743ac87bbd…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 22:02:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 709e7f4f27023994d2a58545185bffe0 SHA-1: 41066818bdf4c1053ad8b2b85b7055a7eeace190 SHA-256: b1a9bb743ac87bbd80260e5dac22e59bea3a32cf8729194782a20cbee2a925af
160 Risk Score

Malware Insights

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

The PDF document contains a lure for game hacks and free generators, directing users to a known malicious redirector. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to exploit users by redirecting them to potentially malicious content or downloads.

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/406889139/free-spin-links-coin-master-2021-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spin-and-trading_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-hack-generator-tool_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-download-apk-softonic_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/pokemon-go-free-coins-promo-code_GM1094591345.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-spin-pattern_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hacks-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-hack-golden-card-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/easy-coin-master-hack_GM406889139.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_off00005260.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5260 24124 bytes
SHA-256: 1b9ebcf36845fd5be86b19061e6c3433674c3091ba02254ec9032b27685b3456
font_01_sfnt_off000089d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D6 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9389 18456 bytes
SHA-256: 2e3762c92aff24b7380dbd76867989e398d3e3dfa703baf994bdeb02abf23f5b

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