Malicious PDF — malware analysis report

Static analysis result for SHA-256 9cdb8d207d9dc7ff…

MALICIOUS

PDF

34.4 KB Created: 2021-07-03 21:45:47 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 8c1f192e249d92459b8922796b8d5065 SHA-1: 7c6ece8a54cb9978a1210a5f5b2d2156aa55eb16 SHA-256: 9cdb8d207d9dc7ff6f29c083ac7b57bd9303db00a5039874957e12c6a8e4f78d
160 Risk Score

Malware Insights

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

This PDF document employs a lure related to obtaining free game items or hacks, specifically mentioning Minecraft and Robux. It contains embedded URLs that point to known malicious redirector infrastructure, such as http://netcdn.tw/app/479516143/how-to-get-minecraft-for-free-on-mac-game-hack. The presence of these redirectors and the nature of the lure strongly suggest an attempt to lead the user to a malicious site, likely for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and embedded links are sufficient to infer a malicious intent.

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/how-to-get-minecraft-for-free-on-mac-game-hack In PDF document text
    • http://perpus.stfm.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/i-want-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-roblox-bugmenot_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-how-to-make-thumbnail-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/coin-master-free-spin-daily-link_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/no-human-verification-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-roblox-accounts-past_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/static-moonactive-net-link_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/coin-master-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/static-moonactive-net_GM406889139.pdfIn PDF document text
    • http://www.perpus.stfm.ac.id/repository/how-to-change-your-name-in-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/roblox-hack-cheat-engine-65-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stfm.ac.id/repository/free-daily-spins-and-coins-for-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_off00003263.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3263 22452 bytes
SHA-256: f2bec543f58be268a6c42064516f8bbecae1be681cdc91f0550ffe8e673183c4
font_01_sfnt_off0000642a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x642A 18164 bytes
SHA-256: c92c54375cfc09bba30268a56a1496ac876777d0f1d8f409b9898aa174c18f72

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