Malicious PDF — malware analysis report

Static analysis result for SHA-256 91998328d6d089da…

MALICIOUS

PDF

34.7 KB Created: 2021-07-05 14:54:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d02f1ba4f1bc62dd5929ddf72762b52b SHA-1: 43ea414ac6f289d52bb23dc932d523590d5b021c SHA-256: 91998328d6d089da25af7a6d2e32264096f05159a2f2498936f2f91622246400
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, designed to lure users into clicking for game-related cheats. The ML classifier also flagged this PDF with high confidence. The document body and embedded links suggest a social engineering tactic to trick users into visiting potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/coin-master-free-spin-and-coins-fbid-links-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/500-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-35-16-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/dragonlord-wings-free-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/instalar-roblox-hackeado_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-phantom-forces-all-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-hack-safe_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-printable-valentines-day-cards-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-hack-2021-ios_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-legend-of-the-bone-sword-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-hack-forum-by-vix_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/gas-station-simulator-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spin-coin-master-iphone_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_002_off00003068.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3068 22772 bytes
SHA-256: b74aed7ad78ed9d28d45ad3593c9b246754a1074811ac33d02e6d4ea8a757797
font_01_sfnt_off00006390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6390 18676 bytes
SHA-256: 262c64d5fcde4ae00765da890d7cc479433627fe6c322491389893b762d4f5bf

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