Malicious PDF — malware analysis report

Static analysis result for SHA-256 84041ac1824cb131…

MALICIOUS

PDF

47.4 KB Created: 2021-06-04 00:31:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 9cf1b47a6b241f7d0ccf17f94657d5c5 SHA-1: 561328853203ebe6c978fc9c1b372862a65838d5 SHA-256: 84041ac1824cb131e3084a1ca7db9dcb3561d8aeef80f42c5cd397a903e0cdf8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a critical heuristic firing indicating it links to a malicious redirector disguised as a game hack generator. The document body and extracted URLs reinforce this, pointing to sites offering 'free spins' and 'hacks' for popular games. While no scripts were extracted, the embedded links are designed to lead users to potentially malicious content or further download stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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 https://netcdn.online/app/406889139/coin-master-daily-free-spins-link-march-2021-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-hacker-mask_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-unlimited-spins-game-download_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-free-pets_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-op-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-coins-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/simplysarc_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-minecraft-for-free-2021_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/boost9-com-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-send-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://www.urcouponsdeal.com/2019/03/coin-master-free-spin-and-coin-links.htmlIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00004fb3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FB3 25804 bytes
SHA-256: 9c6cc721be203c44b6308c26c98f37fd168b5f871044590b6fd5bd372ceb30cc
font_01_sfnt_off000089db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89DB 2960 bytes
SHA-256: 70118f2403bc15c0cdda6be37811ffb9d201381a1258d2d4234aace107a53de4
font_02_sfnt_off00009423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9423 19044 bytes
SHA-256: 3f9aae1fdf8799fca0c9fecd68bec18923aee995b2022bf59fb0518bf5a4831a

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