Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ff323fb7816dd88…

MALICIOUS

PDF

42.5 KB Created: 2021-06-03 10:24:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 2563e78cb5144bee874bb20ba1abd92f SHA-1: 1428fec519a75d96721c0b57193a927bf0e3ad64 SHA-256: 6ff323fb7816dd8882454bcde92caabcc7b6c9a44570caeb78bf97c628b13c55
200 Risk Score

Malware Insights

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

The PDF document displays a fake CAPTCHA to lure the user into interacting with a malicious link. This link redirects to a website offering game hacks, which is a common social engineering tactic. The ML classifier and heuristic firings strongly indicate malicious intent, likely for delivering a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/406889139/coinmaster-com-game-hack In PDF document text
    • http://oca.undil.tl/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-games_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-online-generator-for-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-minecoins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-ios-no-human-verification_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/pokemon-go-free-key_GM1094591345.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_off00004cd0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CD0 24660 bytes
SHA-256: c397a8c57a295b4dc4592733681b80e41edd1ad140fdc81213bd7bb9f0394f32
font_01_sfnt_off000084d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84D3 17808 bytes
SHA-256: 35201c89c21c447e3a5acf437bfd3f20f3f3410cea54d73bd8e308df4a931eaa

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