Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d8081628a4727c3…

MALICIOUS

PDF

48.0 KB Created: 2021-06-10 18:28:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 46dfeac4c4e2b82ca5b9d13587274027 SHA-1: 369baaec49127d9a5ad3bbb1f219edba908d1be7 SHA-256: 4d8081628a4727c3b0e687d4ff0ee500827a70364d4368a2139b01003d8be632
200 Risk Score

Malware Insights

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

This PDF document employs a common lure of free game currency or hacks to trick users into clicking malicious links. The document displays a fake CAPTCHA or human verification prompt, which is a social engineering tactic to encourage user interaction. The embedded links, such as https://netcdn.tw/app/431946152/free-robux-no-hacks-2021-game-hack, lead to known malicious redirector infrastructure, likely serving as a gateway to further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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/free-robux-no-hacks-2021-game-hack In PDF document text
    • http://androidthai.in.th/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/hacking-into-a-roblox-account2021_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://androidthai.in.th/images/vide-hacking-for-roblox-robux_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/roblox-hack-client_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/roblox-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/free-robux-scam_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://androidthai.in.th/images/free-minecraft-shaders_GM479516143.pdfIn PDF document text
    • http://androidthai.in.th/images/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • http://androidthai.in.th/images/how-to-download-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/rare-free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://androidthai.in.th/images/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/roblox-free-robux-legit_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://androidthai.in.th/images/fps-hack-roblox_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_004_off00005008.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5008 31808 bytes
SHA-256: f24159cd5ecf5dbadfb322ab9c8c1b6593faf7bb0d4e68a192546467cb975693
font_01_sfnt_off00009791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9791 18816 bytes
SHA-256: 99f2b6ce4adcea83793b419b85c4cb5363d34d50e0e12fc9de3d1b5715e075db

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