Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0e20bb51f43cc23…

MALICIOUS

PDF

42.4 KB Created: 2021-05-13 11:03:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 18b0b997cdf51d34080c742dce6a5d30 SHA-1: 779154b73c5d2800b041fee19681351d959c751a SHA-256: a0e20bb51f43cc23e7c8a4ec3549354a630f2d64c52271d845c4939facae88ce
160 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically disguised as a 'free generator / game hack'. The primary URL identified is a known malicious redirector. The document body, though heavily obfuscated, contains references to the same URL, reinforcing the lure.

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/479516143/how-to-get-minecoins-in-minecraft-for-free-game-hack In PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/is-minecraft-free-on-computer_GM479516143.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/roblox-hax_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/coin-master-32-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/easy-roblox-today_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/how-to-hack-coin-master-spin-in-hindi_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/como-hackear-coin-master-ios_GM406889139.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/free-robux-scam_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/aimbot-download-roblox_GM431946152.pdfIn PDF document text
    • https://kupinapopust.mk/pub/img/userfiles/files/minecraft-bedrock-client_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
font_00_sfnt_off00004bf2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4BF2 25256 bytes
SHA-256: d47759565d2d992972f7c0e77e485c61f772bb251e72a4f5ec6c43116863e441
font_01_sfnt_off000084c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C9 17872 bytes
SHA-256: d23bbe04ef3196a5fa54f397c57d78b821aa47262b4b410e5e0dbd5db48197bd

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