Malicious PDF — malware analysis report

Static analysis result for SHA-256 f91a14b66ceea08c…

MALICIOUS

PDF

34.6 KB Created: 2021-07-03 16:34:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: be9c509df534e5fbb47b5ccce430e36c SHA-1: 805f56d1a020ce0026f30998ca873844aba5e7c8 SHA-256: f91a14b66ceea08ccd41b742b9454838f36c538071a46554a544c6fe1f7ce986
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures for free Robux or game hacks. The primary lure URL is http://netcdn.tw/app/431946152/real-free-robux-codes-game-hack, which is associated with malicious redirector infrastructure. The document body and embedded URLs reinforce this theme, suggesting a phishing or scam campaign designed to trick users into visiting potentially harmful sites. No scripts were extracted, but the PDF structure and embedded URLs strongly indicate a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/real-free-robux-codes-game-hack In PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/coin-master-hack-for-ios_GM406889139.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/coin-hackhub-coin-master_GM406889139.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/cheats-for-roblox-assassin_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/www-claim-gg-to-earn-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/how-to-get-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/check-cashed-free-robux_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/hacker-vs-noob-vs-pro-roblox_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/roblox-group-fund-robux-free_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-robux-no-survey-no-download-2021_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-limited-items-roblox_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/roblox-fly-hack-we-are-devs_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-minecraft-premium-account_GM479516143.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/roblox-free-robux-codes-http-bitly-robloxinstantapp_GM431946152.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/how-to-download-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • http://www.hiddencanyonbejiguwang.com/assets/CKImages/files/free-roblox-accounts-2021-march_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
font_00_sfnt_off00003145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3145 22044 bytes
SHA-256: e629e1b94460a0bc9046cf2d01a5c27fefa6c2ec17052b6c8d728b74a6213cf2
font_01_sfnt_off0000623c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x623C 18964 bytes
SHA-256: 9bf96aa8fc5477a53da022985f8b40c56c69568a39855eae0c096d595955e7d3

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