Malicious PDF — malware analysis report

Static analysis result for SHA-256 7239d7131b9f23a4…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 05:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 4db9b4339770a9786e15ab84030e7630 SHA-1: fde60c4ebf35b3799f2d42f9845662dddd47b9ad SHA-256: 7239d7131b9f23a43077b97fc68c239c02f64ca8ad59ac8a526298bbfca19f60
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a redirector lure, specifically linking to a 'free generator / game hack'. The embedded URL, https://netcdn.online/app/431946152/demon-roblox-game-hack, is also flagged as malicious infrastructure. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/431946152/demon-roblox-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-tiktok-hearts_GM835599320.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-education_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/www-free-robux-com_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/pubg-uc-hack-2021_GM1330123889.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-link-2021-blogger_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hacks-to-get-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-pet-snacks-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-no-offers_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-generator-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/twitter-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-master_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_off00004f45.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F45 26124 bytes
SHA-256: c821f7083d62351a2ce214cc185cf35aed79b1302e90792c617a382197fd566a
font_01_sfnt_off00008b51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B51 18212 bytes
SHA-256: c9375e33fa218a20af396b21f97d86776c6e3efb35be63d5e3056768a37a53d5

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