Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b75340fb2a81aad…

MALICIOUS

PDF

48.8 KB Created: 2021-06-03 08:23:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: ae543ec87103553d4bf0925785bb6907 SHA-1: 614fb51ed64cf412f247d66ecc01a666d620b14f SHA-256: 3b75340fb2a81aadd73eca4f4e17cdd4fce418bbfe49b15d8fc6e7c14e69e885
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 5

  • 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 https://netcdn.online/app/406889139/free-spins-coin-master-app-game-hack PDF link annotation
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-with-facebook-login_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-inspect_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-download-minecraft-for-free-on-windows_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-ios_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/blox-land-free-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/earn-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/50-free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-free-robux-gg_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-ad_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-tiktok-bots_GM835599320.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spins-and-coins-coin-master-2021-link_GM406889139.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_off000051a5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51A5 30016 bytes
SHA-256: e02a852c1c8f92bed10a5f990a8bdb2c458e95f32b0bd90bbf51f5319e0e1583
font_01_sfnt_off00009393.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9393 2840 bytes
SHA-256: 3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676
font_02_sfnt_off00009d44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D44 17884 bytes
SHA-256: ed1ea3c4e7635b9f65a5e0b6798c92341d7c1feababf17669f4466b6be8364ea

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