Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff919ca82599bd9f…

MALICIOUS

PDF

43.6 KB Created: 2021-06-03 12:43:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: f7f6e0febb0cd3be2f71e22d65d97b19 SHA-1: e5d58430f1f137217268a0a51a4ec306631ba8b7 SHA-256: ff919ca82599bd9f0d67dc4c24a4cfe2d8e735f18c4bebdeed9c919110d28b9b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting a 'free Robux' generator or game hack. The document body and heuristics indicate a lure designed to trick users into visiting these malicious URLs. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or scam attempt, likely leveraging a client-side exploit or social engineering to achieve its objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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-anti-bot-verification-game-hack In PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-gen_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-robux-generator-http-freerobuxgenerator-xyz_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-bedrock-client_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-free-spins-link-october-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/rbx-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/wurst-112_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-and-spins_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/coin-master-free-spins-april-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-cheat_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-free-items-glitch_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/cm-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/windows-10-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-free-spins-bit-ly_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-accessories-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
font_00_sfnt_off00004ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4ED4 24476 bytes
SHA-256: 7694c86b1d1a38c157104bc4ebdcb8fc9ef69213c86e05bb68634f402a70243f
font_01_sfnt_off000086e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E9 18600 bytes
SHA-256: 8cfd8c2479ee29cd4f6dba9b0ab7f96f8a0f4a4bb194f6119df547073888af7b

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