Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f478585efe76eea…

MALICIOUS

PDF

48.1 KB Created: 2021-06-03 19:10:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7cd61b7d57d67362f6aea757cd4e300d SHA-1: 46216d10277dff3f7b20221191bfdb88b5bca60d SHA-256: 8f478585efe76eea64e925bea832b787b7d144093b8445483d96b3cbc07ee453
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and game hack lures, designed to trick users into downloading further malicious content. The document body and embedded links strongly suggest a social engineering tactic to entice users to click through to potentially harmful sites. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/479516143/minecraft-for-laptop-free-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/minecraft-java-server-hosting-free_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-avatar-maker-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-spin-app-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-hack-game_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/fbchampion-com_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-many-villages-are-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/i-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-roblox-camps-uncopylcoked_GM431946152.pdfIn PDF document text
    • https://playhack.in/minecraftIn 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_off000051b9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51B9 31412 bytes
SHA-256: a29db5940a0d232e6a8a90f030cc13c86687001c0f58e0bde185a50bab0a5b64
font_01_sfnt_off000090be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90BE 2840 bytes
SHA-256: 30dce2b9c1950da345d7fed8f00c38887adfa2f2ddecc31775af2315e819ac37
font_02_sfnt_off00009a70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A70 17884 bytes
SHA-256: 9e24751bd8abf3c905aaa0f9e5c5b681bc9bef6aedb2106afbecb5aef0f6c4b9

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