Malicious PDF — malware analysis report

Static analysis result for SHA-256 761c4931addf837b…

MALICIOUS

PDF

35.1 KB Created: 2021-06-26 07:35:02 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a39f9e99bd14fa05ca536d63d10e7837 SHA-1: f970654f7509c13f76880d405940b2475c932502 SHA-256: 761c4931addf837b33be2f4ece3675abaff3754a8ac23b4f7daacb7e479bca8c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks and generators. The document body explicitly mentions 'How To Hack Roblox Personal Servers' and includes a URL pointing to such content, which is a common lure for phishing or malware delivery. The ML classifier also strongly indicated maliciousness.

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.co/app/431946152/how-to-hack-roblox-personal-servers-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-hack-apk-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-no-verification-2021_GM431946152.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/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-survival-games_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-daily-free-spin-and-coin-link-haktuts_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-back-into-a-hacked-roblox-account_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/hack-roblox-players_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-phantom-forces-free-vip-server_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-coin-master-gold-cards_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/skin-roblox-free_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-hack-but-no-surveys_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-coin-app_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-for-chromebook-free_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-roblox-skins-for-free_GM431946152.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
font_00_sfnt_off000031d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31D8 22472 bytes
SHA-256: 9cc5ea7528fbada2a239e9a418b5b027c4d02e7361bd415d734b8fe5d6a588bc
font_01_sfnt_off000063c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63C4 19088 bytes
SHA-256: 47bcd2284f351f9cb5746e9b2864dc13b2f4f0c55d0b1d9c41638e6732f3fb06

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