Malicious PDF — malware analysis report

Static analysis result for SHA-256 e37a9720df73c043…

MALICIOUS

PDF

45.2 KB Created: 2021-05-10 21:44:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 77b6a5d451fa9e16e4dcc03b1ad81703 SHA-1: 75c895050da460bf7df1f950e4e2c945de72b6c8 SHA-256: e37a9720df73c043ec8bb3f7046a7ea4a04e1a076b3a526aa41c5b56a082fd98
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as game hacks or generators. The document body, though heavily obfuscated, contains references to 'Login Robux' and a URL that aligns with the heuristic findings. The presence of multiple malicious links strongly suggests an intent to redirect users to potentially harmful websites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9621

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.xyz/app/431946152/login-robux-game-hack In PDF document text
    • http://hk-kan.org/images/free-roblox-generator_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/instant-robux_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-online-hack-tool_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/hack-download_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/coin-free-master_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/minecraft-java-hacks_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://hk-kan.org/images/roblox-bloxburg-hack_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-free-spins-hack_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-cheat-apk-free-download_GM406889139.pdfIn PDF document text
    • http://hk-kan.org/images/coin-master-free-gift-links-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004a6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A6D 24924 bytes
SHA-256: 796ba966a3502bb58ff04f60bdff6ddce7f26912168b5e4ec2cf9fc5d2c3610d
font_01_sfnt_off000083ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83AC 3032 bytes
SHA-256: 6de6ad4265fa71d97629618d522ed752e156b17a336c60d514b4b872046c257a
font_02_sfnt_off00008e1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E1C 18260 bytes
SHA-256: 4106291cd7227c0d53e90b177fe3a1aab46e5afbd3f4c663f2e449fd295445b0

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