Malicious PDF — malware analysis report

Static analysis result for SHA-256 9f229b8257f19e75…

MALICIOUS

PDF

34.0 KB Created: 2021-07-09 18:56:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 4b20d8fe9ca53fb96f5b7def3c10295f SHA-1: b45b78b57e2e0adc70fef97ab53c65b62191de03 SHA-256: 9f229b8257f19e75edd931b9d64d1aa6cfb7b8dd10af0690da6c7f90cf85ae44
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. 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 4

  • 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.
  • 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/479516143/minecraft-free-minecoins-game-hack PDF link annotation
    • http://www.sharp-calculators.com/files/ckfinder/files/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-spins-generator-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/blox-best-robux_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/i-cant-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-robux-generator-2021-no-survey_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-new-cards-hack_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/microsoft-roblox_GM431946152.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/how-often-pubg-uc-reviewed_GM1330123889.pdfIn PDF document text
    • http://www.sharp-calculators.com/files/ckfinder/files/coin-monster_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
font_00_sfnt_off00003259.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3259 21988 bytes
SHA-256: a3b33f16634c521d3751af3c25dafc8db8bfa0bc845dbe4568306f21b2f8eeac
font_01_sfnt_off000062fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62FC 17996 bytes
SHA-256: 2dfa5331a9f2119d54c4e551e8437d7962f745d427a4edb313ce7568aa6bc23b

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