Malicious PDF — malware analysis report

Static analysis result for SHA-256 2124479e55c9f87c…

MALICIOUS

PDF

48.6 KB Created: 2021-06-03 06:33:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 9182e785506f090e353f5d32fa8f2d81 SHA-1: 79878b24f113db89dc9bccc523f44936855b714b SHA-256: 2124479e55c9f87c94f007e3d52fcc12681938549d73eb87ce1058c302fc2a16
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a 'free generator / game hack' lure, specifically for Coin Master. The primary malicious link identified is https://netcdn.online/app/406889139/coin-master-reward-link-2021-game-hack. This suggests the document is designed to trick users into downloading further malware or visiting malicious sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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-reward-link-2021-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-no-root_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-come_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-pc-download_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-hack-apk-35-13_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/robloxhacks_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/pokemon-go-free-90hz_GM1094591345.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/como-sacar-buen-puntaje-en-juego-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-money-hack_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/get-free-robux_GM431946152.pdfIn PDF document text
    • https://coinmasterspinandcoin.comIn 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_off000052a9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52A9 25928 bytes
SHA-256: ed919690865c4c66a1212d48a0ea2e0bf853affc345d504827fcf75ec81d9033
font_01_sfnt_off00008d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D79 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009764.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9764 19444 bytes
SHA-256: 2591f5dcf65901bfbedbf6bab313a0ea31cdcf0ff6599291a5ed85197115182c

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