Malicious PDF — malware analysis report

Static analysis result for SHA-256 f11b791e5d005639…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 04:58:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a980f0a3b76f2e2ab13b110cca1a02d0 SHA-1: ae32d537dd8cb008c2cf2ad3ddf192ab0baa3b02 SHA-256: f11b791e5d005639a5dc7086027ce6e14bb54ef62bdf4bf6193a9f54df67486d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically `https://netcdn.online/app/835599320/tiktok-for-free-textbooks-game-hack`. This redirector is likely used to deliver a secondary payload or phish for user credentials. The document body and heuristics indicate a lure for game hacks or free items, a common tactic for malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/835599320/tiktok-for-free-textbooks-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-download-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-money_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/minecraft-for-ps3-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-hack-spin-generator_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/pokemon-go-3-free-raid-passes_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/real-coin-master-hack-2021_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_off00004f17.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F17 27684 bytes
SHA-256: 5e2122fbea6dcf2796af312d5fe5b990177cbdae8a27611a3102d611d0c8e5d0
font_01_sfnt_off00008e56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E56 17824 bytes
SHA-256: 04243df8154ed71930de1a6b48a6a414358eab1d588844450dcb70ab7756c918