Malicious PDF — malware analysis report

Static analysis result for SHA-256 d066812b4d7c11a7…

MALICIOUS

PDF

44.6 KB Created: 2021-05-13 15:00:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 226504302a5c884315134e55e4115e33 SHA-1: 92eeae40dd37ff9ae4f8b49d3c81a27312d3b3a8 SHA-256: d066812b4d7c11a70f3cc88876a098332271a14ee30ee4706a8d7be8d3c8c73b
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 0.9632

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/master-coin-free-spin-game-hack PDF link annotation
    • http://escolaarboc.cat/images/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-free-spin-facebook-link_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/free-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coinmasterdailyfreespins-com_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-hack-2021-link_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-free-coins-and-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-hack-1021_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • http://escolaarboc.cat/images/coin-game_GM406889139.pdfIn PDF document text
    • http://escolaarboc.cat/images/how-to-make-your-own-minecraft-server-for-free_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_003_off00004a15.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A15 25000 bytes
SHA-256: b163e1002ea90c587fda253971fbc8c4e551b25d40542a70dd97fd87e87daf77
font_01_sfnt_off00008377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8377 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00008d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D29 17884 bytes
SHA-256: 2eace5707960ab6674c345fc5925bb74d79b72c9d0e947ec779627780b9711cb

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