Malicious PDF — malware analysis report

Static analysis result for SHA-256 afef82b05034d14f…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 05:17:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e20c80942418c0b9d3157e89eea00027 SHA-1: 5b62ee515b673ce840eb7ce3c26486a020153013 SHA-256: afef82b05034d14f041fc3d554af2e9fd43c45a8b8b8793e7062e93194e33b1b
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and infrastructure, disguised as "game hacks" or "generators". The document body and embedded URLs suggest a lure for Coin Master or Roblox cheats, which is a common tactic for phishing or malware distribution. While no scripts were explicitly extracted, the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/406889139/coin-master-daily-spin-link-app-game-hack In PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-hacks-android_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-install-free_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/roblox-hacks-for-mac_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-daily-gift-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/coin-master-club-hack_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-earn-free-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org//repository/real-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/minecraft-112-hacked-client_GM479516143.pdfIn PDF document text
    • http://lib.icbc-indonesia.org/repository/coin-master-free-spin-whatsapp-group-link_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_off00005290.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5290 24796 bytes
SHA-256: 181afb6ba7302af137bb6d9012a855eb1ac05a43cdadd784ce36aa3ef5245882
font_01_sfnt_off00008bfe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BFE 18316 bytes
SHA-256: 1c8f52e50ef16cca0df83ed02daf45b2dac44b7d574d319931a9576780881370

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