Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f5681ac61c7eb60…

MALICIOUS

PDF

47.0 KB Created: 2021-06-03 08:34:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: e7776d34011f5e194740fa0ad61baa35 SHA-1: d797a5622de6162c36d278d48b87c79342a77515 SHA-256: 3f5681ac61c7eb60b4ac53caa5bfe614a6cd78a740f3144c581b930193153adf
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, identified as a link farm, that redirect to pages promising game hacks and free currency. The primary lure URL is https://netcdn.online/app/406889139/free-coins-and-free-spins-coin-master-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and heuristics indicate it's designed to drive traffic to potentially malicious or scam-related websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-coins-and-free-spins-coin-master-2021-game-hack PDF link annotation
    • http://lib.akpnbahtera.ac.id/repository/free-coins-and-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-get-free-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/oprewards-com-login_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-mod-version-free-download-ios_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-coin-hack_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/minecraft-bedrock-free-server-hosting_GM479516143.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-no-download-app-but-play-for-free_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/pubg-600-uc-in-pakistani-rupees_GM1330123889.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/coin-master-free-shield-link_GM406889139.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/pokemon-go-free-and-home-transfer_GM1094591345.pdfIn PDF document text
    • http://lib.akpnbahtera.ac.id/repository/robux-hack-tools_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_off00004fd2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FD2 25292 bytes
SHA-256: 9eb46f12d6383c4d8447248963108414c9d1bd65cd7a10d56778aab4fcfe9ec4
font_01_sfnt_off00008a4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A4E 2880 bytes
SHA-256: b053084cafd01c649462d87667ba56c569d6480ce60e7d20ae57ef6124cf178e
font_02_sfnt_off00009439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9439 18460 bytes
SHA-256: 871f0cb0a27f8e5dd89901f10b004c29658dd5d4ba968b8e0fec3a5b4bbe6c5a

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