Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cc95cbb6225705e…

MALICIOUS

PDF

35.3 KB Created: 2021-07-05 07:42:06 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8d657aceb57dae806aaa18d3a09089d7 SHA-1: d9e9b61733505df562c97b80e7af91891148ed05 SHA-256: 3cc95cbb6225705edbc68a4cb01c8ff4bd78c5ea1c49847d3a88f0a68029698b
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links, identified as a link farm, that lead to websites promising free in-game items or followers for popular games like Roblox and Coin Master. The document body and heuristics indicate these are lures for scams or potentially malicious downloads. While no scripts were directly extracted, the PDF structure and embedded links suggest an attempt to redirect users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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 http://netcdn.tw/app/835599320/free-tiktok-followers-instantly-game-hack PDF link annotation
    • http://aeridefense.com/image/data/files/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-skeleton-package-free-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-on-cliam-free-robux-button_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/get-free-robux_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-codes-toy-for-roblox_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/inject-hack-roblox-com_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-noclip-in-roblox-with-cheat-engline_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-tiktok-coins_GM835599320.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/coin-master-twitter_GM406889139.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-minecraft-skins-pc_GM479516143.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-fly-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-cheat-wall-glitch-download_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-get-any-tool-hack_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://aeridefense.com/image/data/files/free-robux-2021_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_off00003486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3486 22536 bytes
SHA-256: c6b6cca5138e481110aaeb5a5bac97be7f347b91519b05b9e4b16aadb2990dd6
font_01_sfnt_off000066de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66DE 18392 bytes
SHA-256: 2a755dc4b6bc4a838b453748260a0d0dc1090d21b5cdc98b17e57c234e0ee06a

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