Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b323d83c072ec4…

MALICIOUS

PDF

42.9 KB Created: 2021-06-03 09:11:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b5b166f3d975fb0c6df0ded2a52565fe SHA-1: ce437bdc3ad96c77cbf94e75b473a560cc866d57 SHA-256: e4b323d83c072ec45003f7e7e7bfb99e978339a000aebd201ef81e0731d171d4
200 Risk Score

Malware Insights

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

The PDF contains multiple links to malicious redirectors, specifically advertising a 'Coin Master Hack Mod Apk 2021'. The document body, though heavily corrupted, contains references to this hack and a URL pointing to the malicious infrastructure. The presence of a fake CAPTCHA heuristic further suggests an attempt to trick the user into interacting with the malicious content, likely leading to a download or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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.online/app/406889139/coin-master-hack-mod-apk-2021-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-apk-july-29_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-and-coins-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-images_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/sites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-how-to-get-free-clothes_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/can-you-host-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-roblox-accounts-generator_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_off00004f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F01 23800 bytes
SHA-256: 85ddcc84a9b5a217a4bc839d83a5e7b2e5e29e995a3fd5faf4bc0eca8ead6658
font_01_sfnt_off0000840b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x840B 18468 bytes
SHA-256: 047904f8909a7e4c3b1a14c64b1da7715c3370fb20182bdfe55eae790456e9d0

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