Malicious PDF — malware analysis report

Static analysis result for SHA-256 891102220ce7b304…

MALICIOUS

PDF

47.8 KB Created: 2021-06-11 03:18:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 168705330216c8a6a323e07e5e067fb7 SHA-1: 8d7484f2ba232e21157bf779ca80eec330fa7bd1 SHA-256: 891102220ce7b304a10881ebab4b6dfecd9f41e010c9eeaefe5da1b04e21af3d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The heuristic firings indicate a malicious redirector lure and a machine learning model flagged the PDF as malicious. While no scripts were explicitly extracted, the nature of the embedded links suggests an attempt to lead the user to a site that may host further malicious content or exploits.

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.tw/app/431946152/hack-roblox-account-kali-linux-game-hack In PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-roblox-templates_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/roblox-vehicle-simulator-hack-client_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/get-free-spins-on-coin-master-links_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/robux-generator-no-verification-needed_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hacks-for-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/infinite-robux_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/hack-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/free-spins-coinmaster_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library//repository/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://lib.uho.ac.id/library/repository/how-to-stop-being-hacked-on-roblox_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_off0000522c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522C 25536 bytes
SHA-256: 37ed5cc96954a720756047aaf3eddd3e8e15ba3ef8264672ee173863040abab0
font_01_sfnt_off00008d1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D1B 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009705.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9705 18544 bytes
SHA-256: e1872e42663e73a920520215cad64213e64d7102fc4c537e5d0d8e816a9eda58

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