Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb8cc63f297dd956…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 08:40:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 84a4a53911826cab6eb23a0b9b9acfb4 SHA-1: 8dc01caf03c195b2cdeb5d2d63c662f6c37dd803 SHA-256: eb8cc63f297dd956f794b84c4b2efbc07e858464f0e5a60d444cfd3851f9690f
160 Risk Score

Malware Insights

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

The PDF contains multiple links pointing to known malicious redirector infrastructure, specifically advertising 'free generator / game hack' lures. The ML classifier also flagged this PDF with high confidence. The embedded URL http://netcdn.tw/app/406889139/cm-free-spins-game-hack is likely the initial landing page for a phishing or malware download campaign.

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/cm-free-spins-game-hack In PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-no-verification-no-signup_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-vouchers-free_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/robux-today_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-bedrock-free-with-java_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/hacker-vs-glitcher-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/win-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akper17.ac.id/repository/free-spins-and-coins-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_002_off00003037.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3037 22308 bytes
SHA-256: 25dc10b442b12472ab551874833566a7af492f410abe360f1925b148c5933f18
font_01_sfnt_off000061de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61DE 18188 bytes
SHA-256: 1a12182cff9cec0ebe445062587fbe6ab6d65256bbfaabe1a273c3c55968f5eb

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