Malicious PDF — malware analysis report

Static analysis result for SHA-256 c0cb354c649cd620…

MALICIOUS

PDF

35.4 KB Created: 2021-07-05 14:44:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c76c6785eb45f48010ec306715eae678 SHA-1: d3755e6a7c29730bb6b896cc08eb9965761cc94c SHA-256: c0cb354c649cd620272551be98de03f6a0d58b4127b1f41ce49e8eedb613b5f0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game currency and hacks. The primary URL, http://netcdn.tw/app/406889139/free-coins-coin-master-2021-game-hack, is identified as a malicious redirector. This suggests the document is designed to lead users to potentially harmful websites, 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/406889139/free-coins-coin-master-2021-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-free-robux-ad_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/avatar-roblox-game_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-invite-friends-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-wurst_GM479516143.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_002_off000031bb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x31BB 23664 bytes
SHA-256: 052b492dbd2683bf03b43a6daf813df59df0e22363f66d22804b10a04a5673fb
font_01_sfnt_off00006762.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6762 18400 bytes
SHA-256: 2a3e6040a3b782e95a9624477cdba266f2d22bc61ba2df799c05fa910d77e25c