Malicious PDF — malware analysis report

Static analysis result for SHA-256 26cf9475f45321e1…

MALICIOUS

PDF

34.5 KB Created: 2021-07-06 11:55:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 3f027eb3326b05af4204bd8385172a86 SHA-1: 941d993d709919002c58acec7c0b4195e1bf8489 SHA-256: 26cf9475f45321e1d52e36d3188e7e426de38e6b145342e90f4727dbe3318009
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a lure of free in-game currency and hacks to entice users to click on links. The primary URL, http://netcdn.tw/app/406889139/how-to-get-free-spins-and-coins-on-coin-master-game-hack, is identified as a malicious redirector. The document also contains a large number of SEO-optimized links pointing to other PDF files, likely part of a link farm designed to improve search engine rankings for malicious content. No scripts were extracted, but the presence of multiple malicious and redirector links indicates a high likelihood of leading users to further malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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 http://netcdn.tw/app/406889139/how-to-get-free-spins-and-coins-on-coin-master-game-hack In PDF document text
    • http://digilib.unbari.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/kazok-roblox-account-hack_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/is-tiktok-free-to-use_GM835599320.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/wurst-commands_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-daily-free-spins-today_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-spin-gratis-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-bots-for-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-roblox-meme-skins_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/me-hackearon-la-cuenta-de-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-spins-and-coins-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/descargar-roblox-hack-robux-apk_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/download-robux-hack-no-downlowdes_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/is-there-a-hack-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-vip-for-all-places_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/coin-master-free-coins-cheat_GM406889139.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/free-rich-roblox-accounts-passwords_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-free-download-no-app-store_GM431946152.pdfIn PDF document text
    • http://digilib.unbari.ac.id/repository/roblox-hack-2021-free-robux-generator_GM431946152.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_off000030f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x30F2 22608 bytes
SHA-256: e8faef72d202db4ed05fdfcd5e83a43583d7535b162e569a4823c67029653406
font_01_sfnt_off0000633f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x633F 18512 bytes
SHA-256: b5acc537c59d1b7fb5e9a8b7451230baa0910c2ee96a0f773c75b2c56351fbac

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