Malicious PDF — malware analysis report

Static analysis result for SHA-256 87e53c290046923f…

MALICIOUS

PDF

41.5 KB Created: 2021-05-10 21:02:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 44f78a33ad29c652f3fd15a1c5927a85 SHA-1: d043d4d564ee38df7189eb4fa3ea7d00b8d9740b SHA-256: 87e53c290046923fd73fd659bfb2e11a4794ccd220284f408ac9a3b4d1ea1233
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one pointing to known malicious redirector infrastructure. The document body and heuristics indicate a lure for game-related cheats or currency, likely to trick users into downloading malware or visiting phishing sites. No scripts were extracted, but the embedded links are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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-links-to-get-free-spins-game-hack In PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/rbxoffers-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/how-to-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-attacks-coin-master_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-accounts_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-apk-hack-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-free-attack-link_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/coin-master-promo-code-2021_GM406889139.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/minecraft-free-app_GM479516143.pdfIn PDF document text
    • http://e-library.akademitelkom.ac.id/repository/new-free-spins-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_off0000497f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x497F 24044 bytes
SHA-256: 114ed19fed47bcd32254177a4e64b1173b2f2c2046ddcb0c9344287e2e1846bf
font_01_sfnt_off00008082.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8082 18056 bytes
SHA-256: d6f48365c8184d813f3f97722928ecdf71d9bd5c6eacb29ace11fc0c34dd539a

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