Malicious PDF — malware analysis report

Static analysis result for SHA-256 26dc8c161d15a652…

MALICIOUS

PDF

33.2 KB Created: 2021-07-20 11:33:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 3b9d643c6772a49a45a332a9628e06ef SHA-1: cd12b77572dc227763fe1919dc80a4c553f0c487 SHA-256: 26dc8c161d15a652f256d6b5293a2a5934b2acab91283a337d4f91628de07080
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for a 'free generator / game hack' which redirects to a suspicious URL. The document body also contains multiple links to other PDF files hosted on similar domains, suggesting a phishing or malware distribution campaign. No scripts were extracted, but the presence of external links and the lure strongly indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector high 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/835599320/how-to-get-verified-on-tiktok-for-free-2021-game-hack PDF link annotation
    • https://resmed.ear.com.tw/image/data/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/minecraft-free-download-chromebook_GM479516143.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-group_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-discord_GM431946152.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/tiktok-viewer-free_GM835599320.pdfIn PDF document text
    • https://resmed.ear.com.tw/image/data/files/free-robux-no-scam_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_off00002d5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D5B 22368 bytes
SHA-256: 88febd6e46ac4cdcb44e46a0b28017342ba3a8b4a29c26f33873bfa328872794
font_01_sfnt_off00005f5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F5C 18328 bytes
SHA-256: 1054070171948e30c43aa2372c28bb4586f99f9ebf927238267b96eb5d2dcf67