Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f910c8936bbfd2c…

MALICIOUS

PDF

34.4 KB Created: 2021-07-05 03:16:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 60d628f6d043188f02117bbfbab10a31 SHA-1: 00e1fec34d27eb6ad843d7a5986e8f3fabcfc2d1 SHA-256: 5f910c8936bbfd2c72a7f547f4e8021bfbe4565f9516ce8ccefc144a7d7a05c8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators' for popular games. The primary redirector URL is http://netcdn.tw/app/431946152/roblox-promo-code-to-get-free-robux-game-hack. This indicates a social engineering lure designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

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/431946152/roblox-promo-code-to-get-free-robux-game-hack In PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-roblox-robx_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/comment-lancer-proxo-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/bloxburg-hack-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-alien_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/becoming-a-hacker-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/hacker-t-dog-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/pubg-uc-hack-2021_GM1330123889.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/minecraft-esp_GM479516143.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-lumber-tycoon-2-hack-deutshc_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-the-snowman-pachege-free-in-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/free-domino-roblox_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/how-to-get-a-free-vip-server-on-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/roblox-exploit-scripts_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/im-hacking-your-game-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.stipjakarta.ac.id/etd/repository/robux-hack-online_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_off00002f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1A 22152 bytes
SHA-256: 80a8033e8e1d1e8d1799603085d7791acc0802a2602347e8364a70db7de3ed0d
font_01_sfnt_off00006028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6028 19480 bytes
SHA-256: 9c60ac484ed4d96c21d417994060880eaf1182fdd7210cd7b39094265f956726

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