Malicious PDF — malware analysis report

Static analysis result for SHA-256 9eb2bae2372eea1a…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 06:13:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 03fe3db45797963183f661f1f363e4c8 SHA-1: 9c872ad781285592fa70e7c790c38772caf0b486 SHA-256: 9eb2bae2372eea1a799ae9f91aeed9e229f0a8ba5a116041f973207cbaf9e20e
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, including a critical redirector URL associated with game hacks and free generators. The ML classifier strongly flagged this PDF as malicious. The presence of a visual download button lure further supports a malicious workflow, likely leading to a second-stage download or exploit.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/406889139/free-coins-coin-master-game-hack In PDF document text
    • http://lib.unar.ac.id/repository/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/free-coin-master-spins-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-games-just-like-roblox_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-minecraft-java-edition-account_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-hack-fast_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/coin-master-hack-2021-without-human-verification_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/robux-boost_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/get-free-spins-link-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/how-to-get-free-robux-new_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/free-robux-codes-not-used_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/password-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/robloxian-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/level-coin_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.unar.ac.id//repository/how-to-get-a-lot-of-robux_GM431946152.pdfIn PDF document text
    • http://lib.unar.ac.id/repository/minecraft-java-account-free_GM479516143.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_off000035dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x35DD 22856 bytes
SHA-256: 544392b1834dc0d00cd9b1f2d57b2c93ebce0e7f7c2e57bfe6760ec8db7469d6
font_01_sfnt_off000068fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68FD 17996 bytes
SHA-256: db592684bbdaaeb7647633841870edbd5981f70e843d3403859f62ceb8e0c83d

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