Malicious PDF — malware analysis report

Static analysis result for SHA-256 3337785bcfe3c1d5…

MALICIOUS

PDF

42.2 KB Created: 2021-05-19 10:34:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: ae523ae1aab6fa04b8694f895a912d33 SHA-1: 7eb76fb057078c142906841c222510856d652eb6 SHA-256: 3337785bcfe3c1d5be17ebc4d23377e297132daf3f1f5f9bfb467f602af5d430
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free spins' for popular games. The primary redirect URL, 'https://netcdn.xyz/app/406889139/coin-master-unlimited-spins-game-hack', is flagged as malicious. The document body, though partially corrupted, contains references to game hacks and the same redirect URL, reinforcing the lure. The presence of multiple malicious redirector links indicates a clear intent to lead users to potentially harmful content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.xyz/app/406889139/coin-master-unlimited-spins-game-hack In PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-minecraft-alt-accounts_GM479516143.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/moonactive-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack-version-2021_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-tracker_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/robux-free-online_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/download-coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-hack-coin-master-game-without-root_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-free-draw_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-coins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a10.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A10 24500 bytes
SHA-256: 86ecbba46189b8c2e256a6bb66862928c99d03b3879887158b0b21e5eff1441f
font_01_sfnt_off00008248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8248 18416 bytes
SHA-256: 2819b97f5983e3f22772fe648ff6c71d7ba3247a5cdc01de3c66e535b1fe6453

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