Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1a3ec8eb646282f…

MALICIOUS

PDF

42.8 KB Created: 2021-05-13 23:33:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a36e3c50bf835f7fad72bcb54adb4644 SHA-1: 112788d0c81fa034c8917355a713627f47dd29fa SHA-256: a1a3ec8eb646282fb6c5c6d58483dccb01981bc40c6048f2d84715190c2dde9b
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 0.9971

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/free-spin-today-coin-master-game-hack PDF link annotation
    • http://cornerwebstudio.com/images/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-free-account_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/todays-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-free-attack_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/android-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://cornerwebstudio.com/images/daily-spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/roblox-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-coin-master-game_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-coin-master-card-free_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/today-coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://cornerwebstudio.com/images/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://cornerwebstudio.com/images/master-hack-coin_GM406889139.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
stream_003_off00004ce0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CE0 24340 bytes
SHA-256: 93c6016d3c23005f9b0b396ed99fdfaaa4802a8dc5cddf9006ef224cddd5b3c6
font_01_sfnt_off00008526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8526 18240 bytes
SHA-256: 78c04cb83b3c312ccbbb37a13dd02ec2cfa8937d686ae670a5893e360fd0758d

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