Malicious PDF — malware analysis report

Static analysis result for SHA-256 431866f5bedd3ab1…

MALICIOUS

PDF

34.7 KB Created: 2021-07-04 22:59:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: b188fffe3668462b2eb838864535386e SHA-1: 0b39149d73b60e1b5f61eaa2772ebbc445585783 SHA-256: 431866f5bedd3ab124af900c29b5fa09a76b8ce541a1d713193a25119b7daf89
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure related to game hacking, specifically for Coin Master, and embeds a URL that is flagged as a malicious redirector. This suggests the document is designed to trick users into visiting the URL, which then likely serves a malicious payload or leads to a phishing site. The presence of embedded URLs and the 'game hack' theme strongly indicate a social engineering attack.

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/como-hackear-coin-master-sin-verificacion-humana-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/heroes-online-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-gift-codes-2021_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-lvl-1-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-app-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/is-roblox-free-on-pc_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-do-you-get-free-robux-on-tablet_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-use-hack-scripts-in-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-robux-codes-on-camera_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-blood-shirt-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/robux-robux-hack-code_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_002_off00002f5d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2F5D 23380 bytes
SHA-256: d90c28616d8c06d99c91cdb2345401f0359e2260c74e0cff6f88fee4c2223e6a
font_01_sfnt_off00006424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6424 18540 bytes
SHA-256: ca221532449295fc5a272912ffd6ce49f250f345c03bf27bdcddefe1932778a9

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