Malicious PDF — malware analysis report

Static analysis result for SHA-256 715e28fcb65dc0f0…

MALICIOUS

PDF

46.6 KB Created: 2021-06-07 08:45:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8ceafd9994a2ebf4340b53e3e53cb64a SHA-1: afabe8f1581877564d65d057ff81ea8f4aa0904e SHA-256: 715e28fcb65dc0f08ac0b21cd170bed793d73f75fb699d40371405c2264b2925
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as a 'free generator / game hack' for Roblox. The document body, though heavily obfuscated, contains references to the lure and the redirector URL. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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/very-very-easy-hack-roblox-game-hack In PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/rbl-robux-gives-roblox-hack_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-master_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-codes-no-verification_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-hack-tool-robux-and-tickets-download_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-group-funds-roblox_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-hack-roblox-trackid-sp006_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/robux-matchcomfree-robux_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-cheats-com_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-name-tag-hacks_GM479516143.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/hacks-para-roblox-gratis_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/minecraft-toys-for-free_GM479516143.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-get-free-hats-for-free-no-inspect-roblox_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-hack-someone-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/how-to-get-any-packages-for-free-on-roblox_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/roblox-theme-park-tycoon-2-cheat-engine_GM431946152.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/coin-master-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • https://ths-academy.net/wp-content/uploads/fsqm-files/free-tiktok-followers-instantly_GM835599320.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_004_off00005b6d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5B6D 24336 bytes
SHA-256: 9361a057e0fb0569e73f548e8a35c34e34fabf7989e37b4e210d428cc6416753
font_01_sfnt_off000092ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92FF 18496 bytes
SHA-256: 14c8e0f7e25f05d9aebc1a5ea2d661d8405b04e9307fa2888cefc31b750be437

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