Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7d99f9adb365b91…

MALICIOUS

PDF

33.8 KB Created: 2021-07-06 14:33:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c27968f2d484271622a545ac9f5a8bbc SHA-1: 0fe0b5171130b326857b4dee43d231433d192fa5 SHA-256: d7d99f9adb365b91eb2e12c71b92ab1e2948efce8ac62faa6c588a23dba10ad4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically advertising game hacks and generators. The primary URL identified, http://netcdn.tw/app/479516143/minecraft-xray-hack-game-hack, is flagged as a known malicious redirector. The document body and heuristics suggest a lure to entice users to click through to potentially harmful content, likely a phishing or malware distribution site.

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/479516143/minecraft-xray-hack-game-hack In PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/free-spins-coin-master-without-completing-offers_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-upload-audio-for-free_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-free-stuff-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-games-free-to-play-online_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-attack-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-pe-free-ios_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/coin-master-free-spins-link-31-march-2021_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/minecraft-free-apk_GM479516143.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/hack-electric-state-darkrp-beta-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-games-for-free-no-sign-up_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/how-to-get-robux-for-free-no-scam_GM431946152.pdfIn PDF document text
    • http://www.library.umbjm.ac.id/repository/roblox-robux-generator_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
font_00_sfnt_off0000305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305E 22096 bytes
SHA-256: d8d3c0b0ba139d574338de15aca13827857303acf811d333fd55bf03761ad27d
font_01_sfnt_off0000610f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x610F 18432 bytes
SHA-256: 387b7b526c621f44d63a31baef35ce25152a59c4b2bb3bea0ec40756a9ef9a45

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