Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbff7ed0e81d22f0…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 22:15:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 5fddc85c2c1d55af1e7e6cb72bc3dfde SHA-1: ba22f3ff1aaf623656eea6dbc0ae72e3d6ff2448 SHA-256: cbff7ed0e81d22f09b6edabb361997ebe814176bf06a11eb72e9ff40b58778c4
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 0.9769

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.online/app/406889139/hack-spin-coin-master-game-hack PDF link annotation
    • http://www.elibrary.perludem.org/repository/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/earn-robux-websites_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/rbxcity-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/roblox-rewards_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/master-coin-hack-mod_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-ios-no-verification_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/huskybuckscom-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/minecraft-pc-download-free-full-version_GM479516143.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_off00005382.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5382 24960 bytes
SHA-256: a345bc7abe17eaad4983345584913c89bc8788af3a2ebd44e8e5d41905cd42ca
font_01_sfnt_off00008c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C43 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off0000962e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x962E 17892 bytes
SHA-256: 69d13a3c8714eb3dc3a02fadd36b14af4b9de34ef00b9c69ce1967a940d24287

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