Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a3517f96a03d6e…

MALICIOUS

PDF

45.0 KB Created: 2021-06-03 22:05:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 47b2f659d00921ddf54e40904ccafb43 SHA-1: 9a5367eb1565764cc8566e474f15d772f7303418 SHA-256: 10a3517f96a03d6e992a7b815fe9bb13c75636c2a33e68c438f6dfb1f0cf502e
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9865

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.online/app/431946152/roblox-prison-life-free-game-pass-game-hack PDF link annotation
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/robuxfree-con_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-easy_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/unlimited-spin-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-free-trial_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-robux-with-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/minecraft-java-edition-free_GM479516143.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/ro-ghoul-script_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/free-coins-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://www.js100.com/uploads/ckeditor/files/coin-master-free-coins-cheat_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_004_off00004c61.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C61 27968 bytes
SHA-256: d6043cb2401ccd17d6bdbe026ea531c1bf9ea417c2844db8cc8f5f6adab3972e
font_01_sfnt_off00008c52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C52 18708 bytes
SHA-256: 7dfdd2f196a837052a5f6a8c3643f2234bf804c98d1efff01223a63e194e44bc

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