Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e451f5ba99306cb…

MALICIOUS

PDF

42.7 KB Created: 2021-05-18 00:21:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: dd013adefeee9e811a7c36465c9d95f9 SHA-1: e49c8725a6a53b553d1403c04d825e8b551c12dc SHA-256: 8e451f5ba99306cb97eff636c566e667f524a0ed97fda24793e35b6b40f9cd3c
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-ios-game-hack PDF link annotation
    • http://asiasieja.pl/images/60-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-robux-working_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://asiasieja.pl/images/roblox-com-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/rewards-robux_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-roblox-hair-boy_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://asiasieja.pl/images/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://asiasieja.pl/images/coin-master-free-spins-iphone_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_off000049fc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FC 26024 bytes
SHA-256: d290460376bf79fcd402a4bece9b392c6275f72f8e24f761fc92b18275f6ada2
font_01_sfnt_off000085c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85C3 17884 bytes
SHA-256: ed32a7283540f03019957517c048a41e05a4a835eff26d475850fba8ab898570

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