Malicious PDF — malware analysis report

Static analysis result for SHA-256 5daf1da13013537c…

MALICIOUS

PDF

51.6 KB Created: 2021-06-04 02:44:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 8bf436ef2235044c2e69ad88594859e5 SHA-1: 862cbab7e7514d65854b697880710208c155a345 SHA-256: 5daf1da13013537cd55c8f557fb632df99195d90e65c39ef47a55ae4da5b4fea
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free spins'. The document body, though partially garbled, includes a URL that matches the heuristic findings. This suggests a social engineering lure to trick users into visiting a malicious site, likely to download further malware or engage in phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9685

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/daily-coin-master-free-spins-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-roblox-toy-codes-2021_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-back-accessories-roblox_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-robux-for-real_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/easiest-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hack-online-cheat_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/daily-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/install-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-picture_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-cheat_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/earn-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-link-today_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_off00005024.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5024 24688 bytes
SHA-256: 64671b0206dfb44298f5a9e16b195edd5135b0cbab1f10a9747f7bd4862500e0
font_01_sfnt_off00008885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8885 2820 bytes
SHA-256: e5f6ec650849eefe6bc6a1649c2875ce35328d23e4196945bba66cc43e5a49d4
font_02_sfnt_off0000921f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x921F 8676 bytes
SHA-256: e06aca5f85e50ae6cefda302c5299c18ab6d27c174f74f0bb0ee8efa7ccb4468
font_03_sfnt_off0000a6aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA6AA 18308 bytes
SHA-256: 2e377c4e9f27697957871a52337602293a8911c67983c74714bc140e9d069187

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