Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b00cfcedfc5261…

MALICIOUS

PDF

44.7 KB Created: 2021-06-07 05:40:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 5ba453dcf1c618608b41871e0c69e316 SHA-1: 3970f6ce0305bd42e698c92838727036c81cc088 SHA-256: c2b00cfcedfc52610b49ed23e52568dd617b0d84bfc40b7846cf4c91383619e2
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors, disguised as 'game hacks' and 'free generators'. The primary lure URL is https://netcdn.tw/app/431946152/roblox-jailbreak-money-hack-2021-game-hack, which is associated with a critical heuristic firing for malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to game hacks and URLs, reinforcing the lure. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of a phishing or malware distribution attempt.

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.tw/app/431946152/roblox-jailbreak-money-hack-2021-game-hack In PDF document text
    • http://roberto-gac.org/images/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-hack-lost-world-2021_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/hack-robux_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • http://roberto-gac.org/images/get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://roberto-gac.org/images/free-roblox-website_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • http://roberto-gac.org/images/coin-master-hack-cheat-generator-coins-and-spins-unlimited_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_off00004da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4DA4 26052 bytes
SHA-256: 86d7a195bd7c5405d1529053245345414e10868c1fa57f09c98a7a85847fcf51
font_01_sfnt_off00008932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8932 19244 bytes
SHA-256: 7231245a0d29a459ae2987375e036450a6dcc097c16cd245166a12a1a1ef4ff2

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