Malicious PDF — malware analysis report

Static analysis result for SHA-256 c990f84f12f9ff49…

MALICIOUS

PDF

44.1 KB Created: 2021-06-03 10:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 4ff5d4b777be03c80b6cd2ffdc59cd38 SHA-1: 5e375dcbc07632c187b1d0f9bc7fafa674fdd3e1 SHA-256: c990f84f12f9ff495b82c720184efe7c915820b62fd15f82f729e4be3e8ddc76
110 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 and an urgency-based 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 0.9865

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.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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/431946152/roblox-generator-no-human-verification-game-hack PDF link annotation
    • http://library.smpn2-byl.sch.id//repository/hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id/repository/how-to-get-free-faces-on-roblox-youtube_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-do-i-get-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/easy-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/what-games-give-you-robux_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/coin-master-spin-blogspot_GM406889139.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.smpn2-byl.sch.id//repository/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
stream_004_off0000517d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x517D 24316 bytes
SHA-256: c6549d76a70c8a560f0bae66977baed16f190fcb061dcc25d4ddfee009e48497
font_01_sfnt_off00008826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8826 18772 bytes
SHA-256: d79baf027547f44448cd8f3b6712cdcd19f331e765a1a7a1a1aa24219739a308

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