Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b7f9c2db7374f9…

MALICIOUS

PDF

35.2 KB Created: 2021-07-07 06:50:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 0b2fe58c59e994b14f616d6d22aab1a7 SHA-1: aa3aef7562cb60e3c19ad17d0b75f76b8ae0a087 SHA-256: c4b7f9c2db7374f9ecc3644b0b0f0afcce1911f1b894238b9251836e2cc42ba5
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.tw/app/431946152/mobihack-roblox-hack-game-hack PDF link annotation
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-free-spain_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/minecraft-pe-hacked-client-download_GM479516143.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-hack-spins-and-coins-unlimited-free_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/roblox-wall-hacking_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-computer-hack_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/try-minecraft-free_GM479516143.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/body-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-spins-generated-from-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-new-2021_GM406889139.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://elearning.manmabar.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-facebook_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
stream_002_off00003219.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3219 22556 bytes
SHA-256: c48dda9e64b0fc142b86a42649145411f801bf8a9d50af936df0b66670ad7d8a
font_01_sfnt_off00006480.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6480 19136 bytes
SHA-256: f16824342c62f00e4a9bb6916020d565fe0ae913315bb8cfdacdbfad2701e10e

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