Malicious PDF — malware analysis report

Static analysis result for SHA-256 412e44e9b6ee8d9a…

MALICIOUS

PDF

35.5 KB Created: 2021-07-05 18:22:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: c9b0fee4ba7407b4a69e74f9e59964db SHA-1: fa0123a9a128ce304fd3e61b449710c7ba1ab29b SHA-256: 412e44e9b6ee8d9a3cab58ee8daaee5633d4ec237b3272adac33a0d6961b68a7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded links that redirect to a known malicious domain, masquerading as a 'free generator / game hack'. The ML classifier also flagged this PDF with high confidence. The document body and heuristics indicate a lure for free Robux or game hacks, a common phishing tactic.

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/431946152/robux-free-com-game-hack In PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-18-000-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-free-without-installing_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/level-coin_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-real-hack_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/triga-cheat-engine-roblox_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/114-hacks_GM479516143.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-free-hair-girl_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/red-boy-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.serraw.com/uploaded_files/userfiles/files/roblox-games-where-you-can-play-music-for-free_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_off000032cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32CC 22732 bytes
SHA-256: 8f75d71fbb41e4d73f21197e0c1a0ca2e1f999da80f78108983ceb7e5b89442f
font_01_sfnt_off0000660b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x660B 18976 bytes
SHA-256: fb86ad1aad47c5a5c5fa913efd771066ff8edf92cff8bf075126ed023f1935f6

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