Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b81edd4227029f7…

MALICIOUS

PDF

51.0 KB Created: 2021-06-03 14:51:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: fe04f66fd5c046e6d48dbf7176322d0a SHA-1: b6907d46151d09b0ddfcc0277f72f01675c9a318 SHA-256: 9b81edd4227029f7f3cb1fab3f3c8c2cb6a57314442516bd4f1c617f3c01725c
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document employs a common lure of free game currency and hacks to trick users into clicking malicious links. It contains numerous links to redirectors and a link farm hosting many other PDF files, likely to distribute malware or phish for credentials. The ML classifier also flagged this document with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9713

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 https://netcdn.online/app/406889139/coin-master-game-free-spin-game-hack In PDF document text
    • http://lib3tell.stptrisakti.net/repository/tiktok-free-college-books_GM835599320.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/games-like-minecraft-but-free_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/weird-roblox_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-cheats-without-verification_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/tiktok-free-followers-and-likes-apk_GM835599320.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/pubg-uc-qatar_GM1330123889.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-tiradas-gratis-link_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/free-coins-on-coin-master-without-verification_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net/repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://lib3tell.stptrisakti.net//repository/free-robux-working_GM431946152.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_off000050a4.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50A4 24612 bytes
SHA-256: b0e77a93ab6c28fc2b93a876fc732672ae636211a65f480d09d848e9b3f8e618
font_01_sfnt_off00008908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8908 2868 bytes
SHA-256: 00109425b76763440a5569341faade0445b3c9f8514523a6f287fddbc9082efe
font_02_sfnt_off000092f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92F0 7332 bytes
SHA-256: d811e0aca85f3b94c42cd1240eec68b8eb378f3d8be5e408d3f6abd0f11f834d
font_03_sfnt_off0000a509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA509 18148 bytes
SHA-256: 504bf69ab615d46cf168ba32f934bf745dfb0b3d16564297e15ae7f7ea829546

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