Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b01b2fed6f32ca…

MALICIOUS

PDF

34.5 KB Created: 2021-06-24 22:20:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: de6f3dce45d7ba4e27c58063bcdf3461 SHA-1: 35627b05b9e42801e5a5a56cd4af8275290185d7 SHA-256: 99b01b2fed6f32ca67ac2ce681a712d5db7ad294252f9d4a5a3de987daf4b864
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure designed to trick users into clicking a link. This link redirects to malicious infrastructure hosting game hacks and cheats, indicating a phishing or scam attempt. No scripts were extracted, but the presence of malicious redirectors and the fake CAPTCHA strongly suggest a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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 http://netcdn.co/app/431946152/roblox-cheats-for-mac-game-hack In PDF document text
    • http://www.elibrary.perludem.org/repository/youtube-how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/coin-master-hack-online-without-human-verification_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hackeando-los-ordenadores-en-roblox-derank_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-free-no-download_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/best-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/artmoney-pro-roblox-free_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-chakra-naruto-final-bond-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-minecraft-windows-10-with-java_GM479516143.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-do-you-hack-money-on-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/free-minecraft-com_GM479516143.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-roblox-groups-with-funds_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-parkour-bag-hack_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-rich-accounts-in-roblox_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-paintball-on-roblox_GM431946152.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_002_off00002fec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x2FEC 22388 bytes
SHA-256: 82e644b4beb8b380c0118c2ca1bc0c0ffb4b30f9d93b4a040176f1149eb2224f
font_01_sfnt_off000061c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x61C0 19116 bytes
SHA-256: 4d869d668c8a15ea91e0c6924afb6af837879fb2bd7aac16ab8614c3ec2feef5

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