Malicious PDF — malware analysis report

Static analysis result for SHA-256 87f9963019d510b9…

MALICIOUS

PDF

34.1 KB Created: 2021-07-05 11:56:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7aad4b81558aaea62f216546c9f70aaf SHA-1: c7136e066b701be72e2f5ac0dbd301c678b1102e SHA-256: 87f9963019d510b9a01186168202cd30bf3be16902fcd8f88c1179596e768c08
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that lead to a known malicious redirector, disguised as a generator for game currency. The document body and heuristic firings confirm this lure, aiming to trick users into clicking the malicious link. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing attempt.

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.tw/app/406889139/free-gold-cards-coin-master-game-hack In PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/john-roblox-free_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/pubg-uc-400_GM1330123889.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/roblox-for-free-on-phone_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/robux-free-com_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/shooting-roblox-free-too-play-on-line_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/hack-to-get-unlimited-robux-free_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://pustaka.minangkabau.unand.ac.id/repository/minecraft-realms-free-trial_GM479516143.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_off00002fa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA9 22884 bytes
SHA-256: 3a2691e97ebb224c0a1a50600d1bfe999ebe29e60f9cf7bc2ae587e7f244dbd8
font_01_sfnt_off000062ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62CA 18244 bytes
SHA-256: c0b0779b34030300e48718c8cf2fdfe9f3dac7abc045aa5c31b1ba45645f0cee

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