Malicious PDF — malware analysis report

Static analysis result for SHA-256 926ff3c516e48387…

MALICIOUS

PDF

44.3 KB Created: 2021-06-09 04:19:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3e2b7dc7bbcad69a4de297149ee32698 SHA-1: 40d44625f2e545ff93f1dd53f72860af3bd2b6f0 SHA-256: 926ff3c516e483873bd5e178c9a70e118fbdfdea4692ae351dc0e6568787cf65
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA and lures users with promises of game-related benefits to trick them into clicking malicious links. The document contains multiple embedded URLs, including a known malicious redirector, which likely serve to download and execute further malicious content. The ML classifier also flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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 https://netcdn.tw/app/431946152/roblox-girl-shirt-codes-free-shipping-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/robux-win_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-pocket-edition-free-apk_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-reward-link-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-spin-cheat_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robuxhub-net_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-hack-mod-apk-unlimited-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-easy-and-fast_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-for-coin-masters_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-coin-master-game-apk-download_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
stream_004_off00004fd3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD3 24548 bytes
SHA-256: a0dfbe5c8c9f25b1ac83dc27aed4d576df3b0db4b63da26bc2ee01d0e8aa2897
font_01_sfnt_off0000884e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x884E 18976 bytes
SHA-256: 5c6814c9d33c2aae22487456bfdf6d3ce9f067e2e89b5e9e0a3e26e88f05f743

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