Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3633f919f1938f2…

MALICIOUS

PDF

34.3 KB Created: 2021-07-03 10:41:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 43e668ac1f14a01d1b8caf781e4aaaf7 SHA-1: 3cabb6fac79f86cbd68135aa543a8c43ba51a21a SHA-256: a3633f919f1938f2c46a7d5a01981860391f3a9c7743e4d6613f673e88d16161
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 0.9980

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 http://netcdn.co/app/431946152/is-roblox-hacked-game-hack PDF link annotation
    • https://mountainholidaytreks.com/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/50-free-tiktok-likes-trial_GM835599320.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/giftrobux-com-generator_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-spins-2021-today_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-free-pet-food_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spins-coin-master-no-verification_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-script_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/get-me-robux-for-free_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/exploit-roblox-free_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/will-minecraft-dungeons-be-free_GM479516143.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://mountainholidaytreks.com/userfiles/files/rewards-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000305e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x305E 22092 bytes
SHA-256: 36456acb99ea1f754d539ead25ba8867b8262d6cee745cfaa64833bc01e84681
font_01_sfnt_off00006158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6158 18828 bytes
SHA-256: ffc1b06b0aa45cc1a144f1d43e95d37ff53635931ed538feab81aca2c284e8f3

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