Malicious PDF — malware analysis report

Static analysis result for SHA-256 b060c04448520cca…

MALICIOUS

PDF

49.5 KB Created: 2021-06-04 01:44:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 219ccd4555446e601d11a799b8c94d16 SHA-1: efef380c634a36728d6b8291b2029faed631c19b SHA-256: b060c04448520cca00a6c282c9ccca8add893f1da81269de09c4f6b06916b1d4
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to websites offering "free Robux" or "game hacks," presented alongside a fake CAPTCHA lure to trick users into clicking. One critical heuristic identified the primary link as leading to known malicious redirector infrastructure. While no scripts were explicitly extracted, the document's structure and embedded URLs suggest it's designed to redirect users to potentially malicious sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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 https://netcdn.online/app/431946152/free-robux-website-game-hack In PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-pastebin_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-coin-master-root_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-heroes-online_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-vpn-for-minecraft_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-today-gift-reward_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-booga-booga-hack_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spin-coin-master-instagram_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-game-hack-kaise-kare_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-on-chromebook_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hack-card-collection-coin-master_GM406889139.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_004_off0000535d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x535D 28328 bytes
SHA-256: a8aa7144eb32e3ffffc711d2bee1789b24dee52b488d329dfaa961d3e413874b
font_01_sfnt_off00009467.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9467 2844 bytes
SHA-256: d4efd49219a7ff6424c923a6ccef5b7e1750ded18bbd79546f2ad196ddc76c43
font_02_sfnt_off00009e27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9E27 18436 bytes
SHA-256: 681a9996b59f8391b7cc91011c49ef4e68754eb5dc3ad8da1029f3e9c8ab03b4

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