Malicious PDF — malware analysis report

Static analysis result for SHA-256 9afcac08d9d86f73…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 05:23:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b4c9e54da5facde42c8eaa4cd7d446c9 SHA-1: b228fcefdeba2e37cacd24e10558df0e2fced77c SHA-256: 9afcac08d9d86f737f9802f889910a921e832c2707e1606a051dcee799e48f6b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, masquerading as game hacks or generators. The primary lure URL is https://netcdn.online/app/406889139/how-do-you-get-free-food-in-coin-master-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at redirecting users to potentially malicious content or downloads. The ML classifier also flagged this PDF as malicious.

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.online/app/406889139/how-do-you-get-free-food-in-coin-master-game-hack In PDF document text
    • http://muslib.unmus.ac.id/repository/wurst-112-2_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hack-to-send-gold-cards-on-coin-master_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/unlimited-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/pokemon-go-free-download-apk_GM1094591345.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-girl_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-daily-free-spins-blog_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/coin-master-heaven-free-spins-today_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/roblox-april-fools-hack_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-roblox-app_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/robux-best_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/hacked-roblox-accounts-list_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/coin-master-hacksco_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-spins-coin-master-october-17-2021_GM406889139.pdfIn PDF document text
    • http://muslib.unmus.ac.id//repository/free-robux-easy_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
stream_004_off00005226.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5226 25144 bytes
SHA-256: 5c066ed7bc48271f916b2300cbd8f1a89c3637a05c82b9972cbe9d26b35e695f
font_01_sfnt_off00008b53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B53 18516 bytes
SHA-256: ac91f58e21dbb93fb64f3a3444140cfe582f485122f2f3fe207e1bd010819bf3

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