Malicious PDF — malware analysis report

Static analysis result for SHA-256 f90ca9de378a3ad7…

MALICIOUS

PDF

34.4 KB Created: 2021-07-20 08:53:12 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: d1d85f0e24dca2d28fd6a2e012370fe4 SHA-1: c7e1c7c04c61269a38926ab6aa1363da90d8aab2 SHA-256: f90ca9de378a3ad781d0d227136908c7990be59283f2c04c315dc87ffebeffc6
160 Risk Score

Malware Insights

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

The PDF document contains multiple links, including one pointing to 'netcdn.tw', which is identified as a malicious redirector. The document body and heuristics indicate a lure for game hacks or generators, suggesting an attempt to trick users into downloading malicious content or visiting phishing sites. No scripts were extracted, but the presence of malicious links and the lure strongly suggest a drive-by download or phishing attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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/479516143/how-to-get-minecraft-windows-10-for-free-2021-game-hack In PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/real-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/tiktok-likes-free_GM835599320.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://www.manchieu.vn/upload/editor/files/tiktok-views-free_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
font_00_sfnt_off000031f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F6 22272 bytes
SHA-256: 51a2878429730c77af963e42a3e129c9370b493df2ecdecc7611bd58cf8e05c7
font_01_sfnt_off0000633e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633E 18648 bytes
SHA-256: 354bb2c2c4fae14b5c7df711c8f5a389dfe67cd832e4a835714c7b2f7ea7fa4d