Malicious PDF — malware analysis report

Static analysis result for SHA-256 b21dfdeb79781678…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 14:36:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 899242090a1d0001eefb34282a2d9698 SHA-1: 10f92744e07da591cf52d0d6db1abfe8bcd56d4d SHA-256: b21dfdeb7978167822a306f25be9015e9bc0f92a2303b40dc2ee333d130e8236
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, designed to lure users with promises of free game items. The primary link, http://netcdn.tw/app/479516143/minecraft-account-hacked-game-hack, is likely part of a phishing or scam campaign. No scripts were extracted, but the presence of embedded URLs and the heuristic firings strongly indicate a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/minecraft-account-hacked-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-newgen-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/google-how-do-you-get-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-mobile_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-hack-on-robux-store_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/complete-obby-for-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/giving-away-free-toy-codes-for-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-robux-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/drawing-anime-on-roblox-free-draw_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-catalog-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/irobux-com-redeem_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-minecraft-alt-generator_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-account-and-password-for-roblox-with-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-models-hack-your-account_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-weight-lifting-simulator-3-strength-hack_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/earn-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-script-hack_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_off00002fe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FE4 23104 bytes
SHA-256: 7580d6c1d2c49a5c3f36f9204661a09844baf3c4db7d8ae1881a60a5be25fc07
font_01_sfnt_off000062d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62D2 18484 bytes
SHA-256: 5dd05c9cb448aa3988e40803526fd1466b4ff4df0b75d5f1fead4c9123013b57

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