Malicious PDF — malware analysis report

Static analysis result for SHA-256 922798062cff340d…

MALICIOUS

PDF

34.0 KB Created: 2021-07-04 20:42:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 14ab841e9919586746dc93a186144f16 SHA-1: 275eebb52d6086b415a108eb0c19da696978cb20 SHA-256: 922798062cff340da8d2a752cca4c4e4aaf53252e045ae8a86d81ff69bedcba3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to external websites, including a known malicious redirector at http://netcdn.tw/app/406889139/coin-master-fan-hack-game-hack. The document body and extracted URLs indicate a lure for game-related cheats and currency, suggesting a phishing or scam campaign. The presence of embedded links and the ML classifier's high confidence score support this assessment.

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/406889139/coin-master-fan-hack-game-hack In PDF document text
    • http://stitqi.ac.id/website/repository/free-robux-just-click_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-to-get-free-stuff-on-roblox-on-mobile_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-daily-rewards_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/claimrbx-free-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-robux-groups-2021_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/roblox-place-rewards_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/free-coin-master-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/20210-robux_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/mcmaster-club-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://stitqi.ac.id/website/repository/scripts-for-hacks-roblox_GM431946152.pdfIn PDF document text
    • http://stitqi.ac.id/website//repository/free-limiteds-roblox_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_off00002fd8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FD8 22696 bytes
SHA-256: edaa8c3a6f236cab3d4f4c8a0742891d9a052f528a904de347294a18a7b4d6bb
font_01_sfnt_off0000628c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x628C 18168 bytes
SHA-256: f6a958b5ee3bd5b31fa7bb34e70f4f188eadbb3e5a663de667095cc8c499d1ed

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