Malicious PDF — malware analysis report

Static analysis result for SHA-256 893aefa9425389f2…

MALICIOUS

PDF

47.2 KB Created: 2021-06-08 20:58:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: dfc59baef3dda4c20c39a8c48e9b3c41 SHA-1: 8ac16de41a4d1c2b74ceb5a402b4c575dafd8d71 SHA-256: 893aefa9425389f23c8d233fff6e46564685b592359ac362a3258125a38b0b8e
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to a known malicious domain, masquerading as a 'free generator' or 'game hack'. The document body, though heavily obfuscated, contains references to these lures and the malicious URL. The presence of these links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/free-model-robux-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-avatar-com_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-app_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pubg-uc-gift-card-free_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-download-free-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-free-clothes-hack_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-xbox-one-edition-digital-code-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/android-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/earn-robux-sites_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-btools-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-game-hack-online_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
stream_004_off000052d2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D2 29692 bytes
SHA-256: 510d1a71874cd02d8cb1ccca66b679db2a123a3ba6e1b7981936396c53a0e2f3
font_01_sfnt_off00009583.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9583 18460 bytes
SHA-256: c79228443c2daa4c4acaa50d05c8f727c6940834a733a870477a5d815bb0a2d3

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