Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cb3824e79fd7a89…

MALICIOUS

PDF

35.9 KB Created: 2021-07-05 11:22:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 525708a41c3cd2f43f74e87a296059e9 SHA-1: f5f9ba02c888c57c49e3af7e57afed836de26712 SHA-256: 2cb3824e79fd7a89707eb9cffb1c8b554285e665f7ccd4be420f00ce845db8fc
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links that lead to game hack generators and other lures, identified as malicious redirectors. The document body and embedded links suggest a phishing attempt to trick users into visiting potentially harmful websites. No scripts were extracted from this sample, but the primary attack vector is the redirection to malicious infrastructure.

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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.tw/app/406889139/coin-master-daily-bonus-game-hack In PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-hack-mod_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/como-hackear-una-cuenta-de-roblox_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-hack-free-robux-in-roblox-in-a-computer_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/coin-master-apk-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/10-websites-like-no-human-verification-free-robux_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-minecraft-hosting-24-7_GM479516143.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-character-cheat_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-quick-and-easy-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-robux-on-computer-roblox-generator_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-be-a-vip-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/how-to-fix-roblox-laging-in-proxo-hacks_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-mod-apk-free-download_GM431946152.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://slim.sisminkada.net/repository/roblox-rape-hack_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
stream_002_off00003482.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3482 23152 bytes
SHA-256: 762da54bf9656b961de60b8a114168b97d593be10f4f75815ed9e62d8e9093d8
font_01_sfnt_off000068d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x68D9 18612 bytes
SHA-256: 72017a97322e8485497f8fdeabbecd4477664dfde293126b902d1c1106f91e80

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