Malicious PDF — malware analysis report

Static analysis result for SHA-256 22c45bc73afb1f94…

MALICIOUS

PDF

48.6 KB Created: 2021-06-03 07:32:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-25
MD5: d8e78daccfb34085cb83f489ed56c064 SHA-1: a14356bbf0d0e6dc5f222e1291d3fc68cef9dd9b SHA-256: 22c45bc73afb1f94627c07503d6e6c56451bd7abc26ebba54df9fd25d1a8e8a8
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains multiple links to known malicious redirectors and infrastructure, disguised as game hack generators. It displays a fake CAPTCHA to trick users into clicking these links, which likely leads to further malicious content or downloads. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/roblox-hack-codes-game-hack In PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-without-verification-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/guide--coin-master-free-tips_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-for-coin-master-on-1-19-19_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/official-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-world-free-download_GM479516143.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/free-spins-on-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/free-premium-roblox_GM431946152.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/do-you-get-windows-10-minecraft-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/mistplay-robux_GM431946152.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-spin-hack-pc_GM406889139.pdfIn PDF document text
    • http://library.gkigadingserpong.org/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.library.gkigadingserpong.org/repository/coin-master-free-spins-daily_GM406889139.pdfIn 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_off00004d74.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D74 25676 bytes
SHA-256: 1920c52738d86173e6f02f4480e9d6fa6c45c272f3827ae91c67246820073ff1
font_01_sfnt_off000088be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BE 7436 bytes
SHA-256: 4a13d5d8cb047d0703728abd56fadd7857e02dd2d0bdc744bf23c6d558594edd
font_02_sfnt_off00009ac0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9AC0 18356 bytes
SHA-256: 248f759c619fe1c96c576728ba71c16d7d0933fc88833f740ae7987d47f6eb68

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