Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b40382768a05d26…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 12:59:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6ec6cf97f3bb9d99dcafdcf6bb932330 SHA-1: dd2b6f9c45a7deb33c56b5618e0e9efed86b2971 SHA-256: 2b40382768a05d262c6c5a36011db1b275ef266c434f67df17f95408a827c397
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector URL that promises free game currency ('Robux') and hacks, a common lure for phishing or malware distribution. The heuristic firings confirm the presence of malicious redirector links and a lure for game hacks. While no scripts were explicitly extracted, the nature of the lure and the embedded URLs strongly suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting.

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/how-to-get-a-lot-of-robux-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-become-famous-on-tiktok-free_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/tiktok-free-view-editor_GM835599320.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-no-spam_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-minecraft-coins_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-version-download-2021-android_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hacker-club_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-adopt-me-pets_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_off00002d98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D98 21892 bytes
SHA-256: 19ac8e1ad8c81d5af7389cc88532f77ab51dfb424215e8048177536cbe2dcb33
font_01_sfnt_off00005de9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE9 18820 bytes
SHA-256: cdc6a2a788e7d1c038814bd34757d45de3c8708b5dd2a0e8e1b59012f3bb2d4a

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