Malicious PDF — malware analysis report

Static analysis result for SHA-256 81b8ebbd76045307…

MALICIOUS

PDF

47.6 KB Created: 2021-06-08 11:14:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: dc8cf0d5f172f9b9b39b46c843c018d4 SHA-1: 646d6f0a589c158358e8dd5893bf30929e0d2c48 SHA-256: 81b8ebbd760453079fcbb0a15ba174ed24e112a1accddfe2a74467c11a161f35
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links to known malicious redirectors, masquerading as game hacks and generators. The document body and heuristics indicate a lure to trick users into clicking these links, likely leading to further malicious content or exploits. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-free-boy-face-game-hack In PDF document text
    • http://svadba-moda.kg/images/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://svadba-moda.kg/images/best-roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/roblox-hack-generator_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-to-get-a-free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/robux-gift-card-free_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-to-get-free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-to-hack-roblox-accounts-2021-inspect_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://svadba-moda.kg/images/noob-vs-pro-vs-hacker-roblox-bloxburg_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/how-to-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/cheater-robux_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/roblox-one-piece-millenium-hack-no-script_GM431946152.pdfIn PDF document text
    • http://svadba-moda.kg/images/roblox-free-followers-bot-2021_GM431946152.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_004_off00004eaa.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EAA 25832 bytes
SHA-256: ec6aaac3a9f3e050b430a946d054bde338947fee2a985172314700425500f82f
font_01_sfnt_off00008a04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A04 3992 bytes
SHA-256: 43e72e756231cfd354bd65c2ed3b09ad4eff56ad11e7f155ed2920e6bb7860dd
font_02_sfnt_off0000972b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x972B 18356 bytes
SHA-256: 6aaa11d62043f06d89efda6ac5914ddc978663660697e87be88b41eff14dbe30

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