Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ac432317a47c9c…

MALICIOUS

PDF

34.4 KB Created: 2021-06-29 10:13:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: f703d3e58128a5d782fd17134df9b262 SHA-1: 7508c4ced625d93fd56664a9b011ea11046aa834 SHA-256: b4ac432317a47c9caa6b8e6959ad51358f93cab5c7c7e6d5c0d0afe81029434b
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to malicious redirectors, disguised as 'free generator' or 'game hack' lures. The primary redirector URL is http://netcdn.co/app/431946152/free-robux-off-of-roblox-game-hack, which likely leads to further malicious content or malware download. The presence of a password-protected archive lure suggests an attempt to bypass security scanning by encrypting the payload.

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.co/app/431946152/free-robux-off-of-roblox-game-hack In PDF document text
    • http://library.yamasi.ac.id/repository/cm-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-printables_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coins-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/february-22-btools-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/best-way-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/how-to-download-minecraft-for-free-on-windows-10_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-get-free-robux-in-one-minute_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/pubg-uc-on-discount_GM1330123889.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/roblox-catalog-heaven-free-banned-weapons_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-para-jailbreak-roblox-2021-money_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/haktuts-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-to-hack-on-vehicle-simulator-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3077 22304 bytes
SHA-256: 4638565c71e81282ea66650728a2e1ce222b1f040b586b275787785ec60eb83b
font_01_sfnt_off0000624f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x624F 18788 bytes
SHA-256: 6eb41c4db453bfbfef0aa833c2ed911a1a4d0c7f615581ce67c46b32e8250e8b

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