Malicious PDF — malware analysis report

Static analysis result for SHA-256 cac77238788da853…

MALICIOUS

PDF

49.0 KB Created: 2021-06-09 06:41:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d93520d51aa491dfe87144ea24261638 SHA-1: e4c4931f38ed5b94a9ab094c613484d2d5e7e2d0 SHA-256: cac77238788da853ae78dcacd6ee8e5fbc9175b8a38b52327c1d0a863ba4f733
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to external websites, masquerading as generators or hacks for popular games. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting a phishing or scam attempt. While no scripts were explicitly extracted, the PDF structure and embedded links strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/431946152/roblox-free-download-no-app-store-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-daily-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-make-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-items-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-free-online_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/arsenal-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-coins-generator_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-daily-spins-today_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004e62.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E62 27532 bytes
SHA-256: 833dd3c804ffcba09725ffb17a0948c1c99f7695577c87993332a19bebe5f717
font_01_sfnt_off00008d9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D9E 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009ab0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AB0 18960 bytes
SHA-256: e2b11da8ec5bc20c7f56bafbf2aa004161717940619506220aefaef65edd18a1

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