Malicious PDF — malware analysis report

Static analysis result for SHA-256 88d2434868b613b3…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 08:55:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 29238d3479a4de79a684477103fed0f8 SHA-1: 34bff750e2be071d92e5ddf52c6d2863334eb1f8 SHA-256: 88d2434868b613b3b1a1f1e9182f74221db62ccd47cc6d2f46e7a2f62725d70f
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising game hacks and cheats for popular games like Roblox and Coin Master. The document body and heuristics indicate a lure to download or access potentially unwanted or malicious content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or social engineering attack aimed at driving traffic to malicious sites.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/roblox-boxing-simulator-cheats-xbox-one-game-hack In PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-get-free-robux-2021-today_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins-and-chips_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/how-to-hack-someones-roblox-account-on-phone_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/como-descargar-roblox-hackeado_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-builders-club-free-trial-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-spin-ml-link_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-not-fake_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-island-royale-cheat_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/codes-to-get-free-vip-in-roblox-mining-simulator_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/tiktok-free-jazz_GM835599320.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/robux-free-robux_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-wings-in-roblox-2021_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/hack-roblox-players_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://dolphintour.vn/images/uploadsfiles/optifine-pe_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
font_00_sfnt_off00003045.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3045 22440 bytes
SHA-256: cba8a665d19548cba7159c43614da94088d96ae6c7baa7a0553647b0bc997206
font_01_sfnt_off00006251.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6251 19276 bytes
SHA-256: a9dc414b730d9caf06326cf9d4cf66dd1d9e298eaa62ec1044fd4502873f6299

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