Malicious PDF — malware analysis report

Static analysis result for SHA-256 66ffca821ba8e7e8…

MALICIOUS

PDF

43.0 KB Created: 2021-06-04 02:54:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: baa9e04b629161289ace3d30ed8f9d07 SHA-1: 9ba4d04fa509508359f831c0f79ac7c19fb17ffb SHA-256: 66ffca821ba8e7e82f19b988d5f103675de8f54c77c59e5e3add9603fee0338d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting game hacks and cheats. The document body and heuristics indicate a lure designed to trick users into clicking these links, likely leading to further malware or phishing. No scripts were extracted, but the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coin-master-free-coins-cheat-game-hack In PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-skins-boy-free_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-roblox-followers_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/freecoins_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/coin-master-free-coins-and-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/play-roblox-for-free-on-google_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/roblox-www-com_GM431946152.pdfIn PDF document text
    • http://library.fikes.upnvj.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_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
stream_004_off00004e7d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4E7D 24652 bytes
SHA-256: b525058a07fe82d08c4a9c90af4fc314bc7ebcced4d36d23ba05af281429b3d0
font_01_sfnt_off000086e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E7 17876 bytes
SHA-256: 8d554e61e60aeb014de25df31c65578cfce6635275d7afef547caae0d045a026

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