Malicious PDF — malware analysis report

Static analysis result for SHA-256 28ff473b52be44fc…

MALICIOUS

PDF

35.9 KB Created: 2021-06-28 01:41:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: c9df60a87ad566138e57645fb6662696 SHA-1: 9b3195c7de1a12331bcd03d58f1ff75b4c9fb86a SHA-256: 28ff473b52be44fcb8833857fc7de9a2bbbc4791ef64a681b7572c13bda63a7f
160 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and sites offering game hacks and free currency, which is a common lure for phishing and malware distribution. The ML classifier strongly indicated maliciousness, and the document body confirms the lure content. The embedded URLs suggest the primary goal is to redirect users to potentially malicious content or downloads.

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.co/app/431946152/nre-roblox-adopt-me-hack-script-money-glitch-game-hack In PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/backpack-roblox-free_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/free-robux-discord-servers_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/speed-hack-for-all-games-roblox_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/free-robux-hack-video_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/app-store-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/coin-master-hack-xyz-download-free_GM406889139.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/how-to-change-your-username-on-roblox-for-free-2021_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/how-to-get-robux-no-hack-or-anything-free-209_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/free-spin-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/are-the-free-robux-fake_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/2021-roblox_GM431946152.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/google-play-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://jpschoolnewdelhi.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master_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_off0000324f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x324F 22692 bytes
SHA-256: 50e94e0b18d8b9c2d040efb19c948f180a8d3a15aba13f9e7558bd4fd66b223b
font_01_sfnt_off00006524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6524 19772 bytes
SHA-256: be6de9b341e7d43c3a14aa694256389c70b23885897b6659414baaabfdaa868c

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