Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bf20eb64c2fe18…

MALICIOUS

PDF

44.6 KB Created: 2021-06-04 00:56:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: c70e8b6cc11db77954bfba3664dc522f SHA-1: 8012f77fed83ef0b4dc55da6160cc2555388edae SHA-256: b8bf20eb64c2fe1885cf25508d3a8e7ce4f953b3dcc5db1c4950170b12b84fb6
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a lure for a "free generator / game hack" and displays a fake CAPTCHA to trick users into interacting with a malicious link. The embedded URL, https://netcdn.online/app/431946152/free-robux-no-verification-at-all-game-hack, is identified as malicious redirector infrastructure. While no scripts were extracted, the document's structure and embedded links strongly suggest a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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-no-verification-at-all-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/face-roblox-free_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-minecraft-skins-java_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roebucks-no-human-verification_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-coin-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-iphone-free_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/rbxfree-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-tix-generator_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/best-free-robux-sites_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-xray-hack_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/spin-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-obby_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/tiktok-free-view-followers_GM835599320.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/can-i-play-minecraft-for-free_GM479516143.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_off00004fe9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FE9 25520 bytes
SHA-256: 6d7860a65126926912c4cab9ba038ec580088cce0bc26a1b084ae00486cead5d
font_01_sfnt_off00008aa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AA3 18676 bytes
SHA-256: a2274236a7a2e18adabb7b86c58cf77696514c901240e043c32ff4f0260e6091

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