Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2929730616c2294…

MALICIOUS

PDF

44.6 KB Created: 2021-06-03 15:50:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 5fbdbdb435204093cb0c5d597835ac64 SHA-1: 236f61beead174cc16c53341f57fd42bbc3df922 SHA-256: a2929730616c2294dea8014cfc2156b3019798ecc4cb76e87391a063b1f0402d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains multiple links, including one pointing to a known malicious redirector infrastructure. The document body and heuristics indicate a lure for 'game hacks' or 'free spins', likely to trick users into downloading further malware or visiting malicious sites. The presence of a fake CAPTCHA suggests an attempt to bypass security measures or trick users into executing actions. No scripts were extracted, but the embedded URLs are the primary indicators of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/daily-spins-coin-master-game-hack In PDF document text
    • https://www.jcn.co.uk/uploads/files/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-pet-treats-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/best-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/rbx-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-tiktok-likes-quick_GM835599320.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/coin-master-cheats-and-hacks_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://www.jcn.co.uk/uploads/files/files/free-robux-hacks-no-verification_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_off00005013.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5013 25616 bytes
SHA-256: e3312bb322191251109ad41ed2bd8bd66807dfe66aa7a370d71979b8b1f0854a
font_01_sfnt_off00008c24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C24 18144 bytes
SHA-256: 1262f4d4cd034a4c9562a277dbba73095a6416475eb754b173a4e193cc6b3510

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