Malicious PDF — malware analysis report

Static analysis result for SHA-256 2db1547970647717…

MALICIOUS

PDF

43.4 KB Created: 2021-06-11 03:36:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 217c2f0c2e4032d2f9109cb31a176f2b SHA-1: 6f27bae2700982918d4e617a88b9bfaedcc81638 SHA-256: 2db15479706477173df82b543fa598adcfcb0555f366778af573db316a463b5c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector sites, masquerading as game hacks and cheats, which is a common lure for phishing or malware distribution. The embedded URLs, such as https://netcdn.tw/app/431946152/download-roblox-free-windows-game-hack, are indicative of a malicious redirect chain. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to drive users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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/download-roblox-free-windows-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/websites-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-connection-lost-hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-tiktok-followers-zonder-verification_GM835599320.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-stars_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-hacks-free-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-free-spins-2021-haktuts_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-girl_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master--hack_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/minecraft-hacks-pc_GM479516143.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
font_00_sfnt_off00004d33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4D33 24836 bytes
SHA-256: c172de5180dbc9aaad22804c669ba1b66f37ace764d5446563a843fd4bd55723
font_01_sfnt_off000084c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84C7 19000 bytes
SHA-256: 9ba8ec1efb50f8375fc64b7df5052a058ed9add02118a9697e98806c95d1d97b

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