Malicious PDF — malware analysis report

Static analysis result for SHA-256 81d4f76f67194850…

MALICIOUS

PDF

55.5 KB Created: 2021-05-13 16:24:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 1e78dc31821d8e6f1d8dea4e2e968a83 SHA-1: d7170bd9cb507278ec3bf9a310e8b5d4cc975d83 SHA-256: 81d4f76f6719485027d1f079b1e23506b73cfb79e1828dd68c7c99c0814a9dcb
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8324

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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-free-spins-2-5-2021-game-hack PDF link annotation
    • https://transjawatravel.com/ckfinder/userfiles/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/free-coins-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/minecraft-sign-up-free_GM479516143.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/coin-master-spins-for-free_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/free-spins-coin-master-apple_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/free-minecraft-server-hosting-with-plugins_GM479516143.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/coin-master-gifts_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/how-to-get-free-premium-roblox_GM431946152.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/coin-master-free-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/coin-master-tricks_GM406889139.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://transjawatravel.com/ckfinder/userfiles/files/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bd9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BD9 26172 bytes
SHA-256: 1adf0dd065b742d5d81e1996efa54683e78970089f5517c5e9480fe936073e24
font_01_sfnt_off000088ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88CA 3232 bytes
SHA-256: fc47885898e00b4bfd7236352f616995a7674a1bc72c954a414de2c300e5c156
font_02_sfnt_off00009428.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9428 7960 bytes
SHA-256: cf7ae5cf6bef3222f5a26bec705b492fed0278aec6b16ec101aeda46e0edd2b2
font_03_sfnt_off0000a74d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA74D 18420 bytes
SHA-256: fc9c1cd0ccc985f14e0cb904a615d0991f1fd615bf6bb58e7d206b3ec4fad204
font_04_sfnt_off0000c9de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9DE 4272 bytes
SHA-256: fac9a06ceb5574feb8580c075df3ef69dfbd0efa4947186cfe90f11b68eaafb0

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