Malicious PDF — malware analysis report

Static analysis result for SHA-256 50c251aee5a7b1f0…

MALICIOUS

PDF

44.5 KB Created: 2021-06-03 14:52:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 4751d91d2a4899e1952f0fc02db0f74b SHA-1: 1f68f79873b2d167ec3d818c6a3afbccef8c6921 SHA-256: 50c251aee5a7b1f01b23cb3e4fe366a27e8e0198d819e2082214bb9baf70c58b
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains multiple links to websites offering game hacks and free in-game currency, a common lure for malicious redirects. The heuristics indicate the document links to known malicious redirector infrastructure and uses lures for password-protected archives and remote support tools, suggesting an attempt to trick the user into downloading or executing further malicious content. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • 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
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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/479516143/classic-minecraft-net-hacks-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/hacks-master-coin_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-face-roblox_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-daily-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-make-clothes-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/50-000-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-tiktok-followers-no-human-verification_GM835599320.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/cheats-for-coin-master_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_off00005279.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5279 25980 bytes
SHA-256: 8932287a6e1963f3008fd97cdf65d939df50668faf93429861d6645661bcce2e
font_01_sfnt_off00008ce9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CE9 17812 bytes
SHA-256: 06eb0692cb0ff670c8084f221f19fc536b6b0c4a84b00058b05a05adc7fae17c

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