Malicious PDF — malware analysis report

Static analysis result for SHA-256 7386db146e94d23a…

MALICIOUS

PDF

34.4 KB Created: 2021-07-04 18:21:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d4b152c952caa8e3354415708764e6e4 SHA-1: 5a191b15fe37dcf22912e1fbf4f9debf5d128bf6 SHA-256: 7386db146e94d23a51579e349342849ec4dba5ef955bbe5397b6ca39bd2e26ed
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a lure for game hacks and displays a fake CAPTCHA, aiming to trick the user into clicking a link. This link redirects to malicious infrastructure, likely to download and execute a second-stage payload. The ML classifier strongly supports the malicious nature of this PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/479516143/minecraft-diamond-finder-hack-game-hack In PDF document text
    • http://lib.stimykpn.ac.id/repository/hack-in-roblox-rc7_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/pokemon-go-free-007_GM1094591345.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/best-free-hair-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-free-robux-game-test_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free4mobile24-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/how-to-hack-roblox-accounts-on-ipad-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-roblox-admin-in-any-game_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-gui-roblox_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/robux-cheat-net_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-script-injector-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/free-robux-generator-that-really-works-right-away_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/can-you-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.stimykpn.ac.id//repository/master-coin-free_GM406889139.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/roblox-obc-lifetime-free_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/bbg-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.stimykpn.ac.id/repository/troll-avatar-roblox-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_off000030da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30DA 22336 bytes
SHA-256: b3c17bcc3177c0f8c7ac27695276f9def297f7963ad258fdf317e91c64c306ba
font_01_sfnt_off00006264.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6264 18768 bytes
SHA-256: 1598c3682c859f253aba253f2e5c14b5c25da3ef850df7010b86b0bb11aa0ad8

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