Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e5a87b04c8b29fc…

MALICIOUS

PDF

45.7 KB Created: 2021-05-17 02:12:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: c952a8fc91520b8bbdb9d0e6fbaba601 SHA-1: 491cf35b73b92088e0708ed55fe75ff73678e8d2 SHA-256: 6e5a87b04c8b29fc228e75f3496d8767ecdf6a75561ad29cac744c7def88ce61
142 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure and a fake-CAPTCHA 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 6

  • 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.
  • 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
  • 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.xyz/app/431946152/rewardrobux-com-game-hack PDF link annotation
    • https://www.takathmanduhotel.com/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-coins-spins_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-com-no-verification_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-official-fan-page_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-gold-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-game-free-spin-download_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/download-coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-no-email_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/how-to-get-free-chest-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-robux-no-scam_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/real-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/minecraft-dungeons-free-download-pc_GM479516143.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-online_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/free-shields-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/coin-master-free-spin-27_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://www.takathmanduhotel.com/userfiles/files/roblox-catalog-free_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_003_off00004c17.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C17 29124 bytes
SHA-256: b234e907236255e49526adda9b4bf46eb597ad80d9adfd02e4ed9a91bef68f96
font_01_sfnt_off00008f1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F1B 18676 bytes
SHA-256: 7669e564bd091b207fd11e388173a1fc76ed62ef873f42ab23981861f0020ac0

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