Malicious PDF — malware analysis report

Static analysis result for SHA-256 649884e731dc6877…

MALICIOUS

PDF

33.5 KB Created: 2021-07-05 14:52:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: ded4b6c1f2775328fce4d55b5c5deb24 SHA-1: b4a44742596c0b1d2bf5889df1c0c0ba753baf6d SHA-256: 649884e731dc68779dc2985b1d68f6a4500e0d32690027f612289f1b37840d89
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 generators' or 'game hacks'. The primary link, http://netcdn.tw/app/406889139/free-spin-coin-master-2021-game-hack, is identified as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick the user into downloading a second-stage payload, likely through a drive-by download or a deceptive link.

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-spin-coin-master-2021-game-hack In PDF document text
    • http://lib.uho.ac.id/library/repository/www-roblox-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-8-14-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-printables_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/50-free-scripts-roblox_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-client_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-apple_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-coins_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/pubg-uc-myanmar_GM1330123889.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/http-bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/roblox-rules_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hack-my-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/hacker-minecraft-song_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_off00002cf9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2CF9 22536 bytes
SHA-256: 91aea21ebf82dcdb9ad1471ac2eb36923e96afa6ef3adbb0bc7d09285a8ff6c6
font_01_sfnt_off00005f38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F38 18576 bytes
SHA-256: 3af2a790f1bd7a3afb398ecfc348a5559e4db05f514a45e9361d5c46150add68

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