Malicious PDF — malware analysis report

Static analysis result for SHA-256 4715c814a7a3ea71…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 12:34:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b4bccdfc3a7cd7cea3e60985bdd7d522 SHA-1: 91495090b1e5ed5fdc84c98c2071df2aed02c2d0 SHA-256: 4715c814a7a3ea711e1671626142f1c7bb8cb34b21733de6b4d2b613f331a2a5
162 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous links designed to lure users into clicking on game hack generators and free currency scams, specifically targeting Roblox and Minecraft. The heuristic firings indicate a link farm and a game hack redirect lure, strongly suggesting a phishing or scamming attempt. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely leading to malicious websites or further download stages.

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/431946152/roblox-april-fools-hack-game-hack PDF link annotation
    • http://libnh.stikesnh.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/youtube-how-to-get-free-items-on-roblox_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-coding-guide_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/how-to-get-free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-hack-inspect_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/roblox-skin-free_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/dailyrobux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/hack-robux-app_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/www-cheatsk-com-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/coin-master-free-stuff_GM406889139.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/minecraft-windows-10-hacked-client_GM479516143.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/easiest-way-to-get-free-robux-no-test_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://libnh.stikesnh.ac.id/repository/free-spin-coin-master-ios_GM406889139.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_off00002edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EDD 22476 bytes
SHA-256: a815e2bfc8839b37472915e84f2c6d549540e02bbd106dea77f0e48307a5933e
font_01_sfnt_off000060ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x60ED 19116 bytes
SHA-256: 957a6bf5bd2c1b396ff8ef3f5dcaebf30264b35c98f1aeb878ab2774c8dd316e

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