Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f888dd627eb5ecd…

MALICIOUS

PDF

32.0 KB Created: 2021-07-19 10:12:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8294742b3d284f706738ddaf92e0446e SHA-1: 0bdf5afc9f4f4d25529c833779aa1837e2042bb7 SHA-256: 8f888dd627eb5ecdd8c93bd82338e2588697eecddedd33ce71f4ba86019fa75e
160 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector domains that host lures for free in-game currency or social media engagement, such as 'free Robux' and 'free likes on TikTok'. These links are designed to trick users into visiting malicious websites, likely to download further malware or engage in phishing. The ML classifier also flagged this PDF as malicious with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9445

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/835599320/how-to-get-free-likes-on-tiktok-game-hack In PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-robux-no-password_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-likes-on-tiktok_GM835599320.pdfIn PDF document text
    • http://kmh.ddnsthailand.com/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.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_off000028bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28BD 23332 bytes
SHA-256: 58612703e439d8b6355200dbb74f408cf412db43775299bc9d7a91d56d60861e
font_01_sfnt_off00005d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D4E 17620 bytes
SHA-256: 1c33fd3c5ea4f422d018a8404ca3ef9e1ac10e3d86ac92994d8eaeb97cd646a5

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