Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0b8231dfab21f9…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 08:28:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 10458dff3473e11bc3a09328bd0ae2cf SHA-1: 6e4ad71214dbeda9583dede5c2fe667fd688d5e7 SHA-256: 3b0b8231dfab21f9922dd119832b2e98ee2f705ab360f8e4d51450bebca1244e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The ML classifier strongly flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate a phishing or scam attempt designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.online/app/406889139/moonactive-free-spins-game-hack In PDF document text
    • http://library.yamasi.ac.id//repository/i-didnt-get-my-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/50-free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/open-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/free-roblox-scripts_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-the-complete-handbook-collection_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/ios-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/hack-coin-master-site-rssingcom_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/how-do-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/can-you-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/pokemon-go-free-83_GM1094591345.pdfIn PDF document text
    • http://library.yamasi.ac.id/repository/minecraft-xbox-360-free_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-games-free_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/minecraft-ore-finder-mod_GM479516143.pdfIn PDF document text
    • http://library.yamasi.ac.id//repository/roblox-arsenal-hacks-download_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_004_off00004fd4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD4 25144 bytes
SHA-256: 601e42d0e02cf58db39591e81879f5d4179abfa6d7f1c93644024c4eac548f41
font_01_sfnt_off000088fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88FA 3620 bytes
SHA-256: 45deaeed358c00ee6597d1f1cb44cba42655038eca744786c033c123ee9bba86
font_02_sfnt_off000095be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x95BE 18000 bytes
SHA-256: 525e065cc595701650099d1f547d5a2db26dd24a903bd4cc3081529fc79bef99

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