Malicious PDF — malware analysis report

Static analysis result for SHA-256 390d674af25c7f0a…

MALICIOUS

PDF

45.7 KB Created: 2021-05-19 03:08:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 0cdfb25560fbe2e8f631593d6ff6c3b9 SHA-1: 0016776d5f25eb7316a470e4d4eb93fe24c0ad2c SHA-256: 390d674af25c7f0a1cb50137248defe3a467514e62962964074293a7a82ad1db
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to a specific URL. This URL is presented as a 'free generator' and 'game hack', indicating a social engineering tactic to trick users into visiting a potentially malicious site. The ML classifier also strongly flagged this PDF as malicious. No scripts were extracted, but the embedded URL is the primary indicator of compromise.

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 https://netcdn.xyz/app/406889139/coin-master-free-spins-generator-no-human-verification-game-hack In PDF document text
    • http://perpus.masda.ac.id//repository/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/mcpe-master-hack-unlimited-coins-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-coin-master-343-apk_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-spin-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-no-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-game-free-download-for-pc_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/free-minecraft-capes-no-mods_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-hack-spins-apk-download_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/how-to-get-free-robux-instantly_GM431946152.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-links-for-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/minecraft-free-online-games_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/114-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id//repository/coin-master-daily-free-spins-link-app_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.masda.ac.id/repository/hacks-para-coin-master_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_003_off00004ea0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EA0 32336 bytes
SHA-256: f80ed18b95360f554c6897028f40bb3f72ccc20620d6b986a653afb164db9928
font_01_sfnt_off00009021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9021 18420 bytes
SHA-256: 5666420d0e9e44cf94ff5bc1a89fe89c7b251afc3257ed355cbd646c92026872

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