Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fefa30d677ca69…

MALICIOUS

PDF

35.2 KB Created: 2021-07-06 08:35:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 137e2ca12cc22f5600804725440d6c1e SHA-1: d4dd3e93fb038f821424bdec2f080e1c9d589abc SHA-256: d1fefa30d677ca69eb7217264fd3e56923e6034b6ebe5289a15e60029a0d2875
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to malicious infrastructure, masquerading as generators for popular games. The heuristic firings indicate these links are part of a known malicious redirector chain, designed to lure users into clicking on deceptive content. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam 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/coin-master-free-spins-daily-2021-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/rbxoffer-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-roblox-dominus_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spin-link-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/getrobux-now_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-hack-version-download-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-cheat-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-obby-on-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-coins-and-spins-hack_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-play-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/daily-free-spin-link-for-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_002_off000030a1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x30A1 23168 bytes
SHA-256: 83279839b866272071b295be2ed34dab775d0c3d0530986207c9b4ca0c700199
font_01_sfnt_off000064e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64E3 19000 bytes
SHA-256: b814766d9c7402c53a67f950003b037573ebc2ab6a90739559792a4ced8a8c51

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