Malicious PDF — malware analysis report

Static analysis result for SHA-256 489044e28a2cea39…

MALICIOUS

PDF

33.4 KB Created: 2021-06-19 07:26:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 38f234402208bab7d10b06374093a497 SHA-1: 1b6288c56ef455a4a13549fc3306cf243699089b SHA-256: 489044e28a2cea3981f34a90bfe9b300dc7e4390ebf715e951bb69b735979d8a
180 Risk Score

Malware Insights

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

This PDF document contains a malformed exploit stream and links to known malicious redirector infrastructure. The primary lure is a "free generator / game hack" which directs users to the URL http://netcdn.co/app/431946152/free-robux-hacker-us-game-hack. This suggests the document is designed to exploit vulnerabilities or trick users into downloading further malicious content.

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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/free-robux-hacker-us-game-hack In PDF document text
    • http://hondenspecialist-engelien.nl/images/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/how-to-get-minecraft-for-free-on-laptop_GM479516143.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/how-to-hack-roblox-prison-life-20_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/roblox-hacked-version_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/roblox-app-is-hacked_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/coin-master-spins_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/how-to-hack-in-roblox-mad-games_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/can-lucky-patcher-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/how-to-hack-games-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/www-rubux_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/coin-master-villages_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/make-free-robux_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/minecraft-games-free-download_GM479516143.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/http-coin-master-hack-club_GM406889139.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/roblox-hack-com_GM431946152.pdfIn PDF document text
    • http://hondenspecialist-engelien.nl/images/how-to-get-free-coins-on-coin-master_GM406889139.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_off00002cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CC9 22100 bytes
SHA-256: 3525dc97ff5e263649461180a01cac8a60c2780f2f3d191fb19043ca4bc44efe
font_01_sfnt_off00005de3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5DE3 18884 bytes
SHA-256: bfc674629a4fdfc233a3c1a19cbee54387e60bd0cdfc4a3107778b42d9fa82d8

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