Malicious PDF — malware analysis report

Static analysis result for SHA-256 21a31c86c8674e53…

MALICIOUS

PDF

48.1 KB Created: 2021-05-16 17:30:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: f26689796f9534e0cdea7165cffe03eb SHA-1: 3617a3ac59f3ed55bee66253e5ecd5f0a18ca460 SHA-256: 21a31c86c8674e53b00029ce86848f1f3bd3cccaf44582976410cfcb8dc4d931
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links designed to lure users into clicking on 'free Robux' or game hack generators. These links redirect to malicious infrastructure, indicating a phishing or scam attempt. The presence of embedded URLs and the ML classifier's flagging strongly support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

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 https://netcdn.xyz/app/431946152/free-robux-codes-2021-game-hack In PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/300-daily-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-rewards-app_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-now_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/code-free-robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/robux_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/play-roblox-free-online_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-hack-generator_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-robux-kid-friendly_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://sellitafrica.com/media/storage/editor/files/free-roblox-acc_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004b9c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B9C 25972 bytes
SHA-256: e5d7ff8a50f7316ecd3bf6ba6fecd4afb49168df233a93d384bb28164a74c2a5
font_01_sfnt_off000086af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86AF 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9891 18588 bytes
SHA-256: 0c0011b59677f21f59199ad7d2a82948105ed154610022cedcbab6f052c91d55

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