Malicious PDF — malware analysis report

Static analysis result for SHA-256 99178b3f4d8acd5b…

MALICIOUS

PDF

36.1 KB Created: 2021-06-30 11:38:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 2bf26f109bc35d20301b42998448c729 SHA-1: 287f78aa69654cbed0264b0bede8592c8d1479a0 SHA-256: 99178b3f4d8acd5b1681dc7f03c14ed6a254f8e0bb919fd5782485d9b832216f
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a malicious redirector lure, specifically targeting users interested in game hacks and free currency. The document body and embedded URLs point to a primary redirector URL that likely serves further malicious content or exploits. The presence of a 'download button' lure and password protection instructions suggests an attempt to bypass security controls and trick the user into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.co/app/431946152/prison-life-gives-free-robux-game-hack In PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-admin-on-roblox-without-cheat-engine_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/hack-roblox-account-passwords_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-daily_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-get-free-hat-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-daily-rewards_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-skyline-hack_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-tiktok-views_GM835599320.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/roblox-bee-simulator-hack-download_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-punch-animation-roblox-r6_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-2021-no-hacks_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-pet-food-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/como-usar-cheat-engine-no-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/how-to-earn-robux-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/free-robux-key_GM431946152.pdfIn PDF document text
    • https://elibrary.ikhac.ac.id/repository/coin-master-free-coins-and-spins-link_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
font_00_sfnt_off00003418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3418 23148 bytes
SHA-256: 39488f287fdd599f4c08f4297dcc7b715382b134087fc82a856febc9f08ff4a1
font_01_sfnt_off000067f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x67F3 19104 bytes
SHA-256: 4dafa65d624d65b7207483235324b6c240b2296f3169ea46d199e9121474e8dd

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