Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ebd8bab8779d664…

MALICIOUS

PDF

50.6 KB Created: 2021-06-03 14:17:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 92813b8e6e8a35147e5cf700281daa06 SHA-1: 1b97e843b8b8b22096ab0e0796ba8e0ea0654abe SHA-256: 3ebd8bab8779d664f2d0165d448e0fa229809b30bd62bbebfccafb8b9ab16590
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, leading to a "free generator / game hack" lure. The document body and heuristics indicate a social engineering attempt to trick users into visiting this malicious URL. No scripts were extracted, but the presence of embedded URLs and the ML classifier's high confidence suggest a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9681

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/coin-master-free-coin-and-spin-app-game-hack In PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/can-u-make-t-shirts-for-free-roblox-2021_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/my-roblox-avatar_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-free-spins-glitch_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/how-to-get-free-roblox-items_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-cheats-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-rewards_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/pokemon-go-free-coins-2021_GM1094591345.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-reward-link_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://lib.mbp.ac.id/repository/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005178.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5178 25988 bytes
SHA-256: 02fba4b23a837bc34ad297402b0473b1120e2e1bc52a33debd84e5f1492d8e52
font_01_sfnt_off00008bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BF0 4028 bytes
SHA-256: 6a4891da4f8b73c02e22ecd6fa566d6bb4f5f2d5575b30a343f3d3c5e0919267
font_02_sfnt_off00009993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9993 2788 bytes
SHA-256: 6fd7c7f447d66842f81aa8cf197935b17f22157d0c7e9f95622df1b5b4ddf530
font_03_sfnt_off0000a383.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA383 18060 bytes
SHA-256: f77ee24e01944806ea28e16fd73427a54f7109e241804df06ce657d8c6d11cfb

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