Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8722beca0a069aa…

MALICIOUS

PDF

35.0 KB Created: 2021-07-05 17:59:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: cb5afd2c5276f8b98126f345d5ddbc18 SHA-1: 3217959a10db1187b7bcfb7058a8d8438e821c03 SHA-256: d8722beca0a069aac48720e275b3724efb72a4fda6856b01a5d83f4a5c38ee68
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/406889139/free-spin-links-coin-master-october-30-2021-game-hack PDF link annotation
    • http://fkunismuh.org/perpustakaan//repository/freecoins_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/www-rbxmaniac-com-free-robux_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-spin-coin-master-link-download_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/roblox-dragon-ball-final-stand-cheat_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/minecraft-apk-114_GM479516143.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/coin-master-free-spins-link-facebook-page_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/spin-and-coin_GM406889139.pdfIn PDF document text
    • http://www.fkunismuh.org/perpustakaan/repository/how-to-get-robux-for-free-that-actually-works_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan//repository/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://fkunismuh.org/perpustakaan/repository/free-robux-without-any-verification_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_002_off0000307f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x307F 22764 bytes
SHA-256: 32bd175fb43ce7a1eadffa0ad77c2ff693ccbdfd9ec4b1c5feabbd397b4cd88b
font_01_sfnt_off0000637d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x637D 19080 bytes
SHA-256: d0362b99e81d912742d9f6f5a3729dd1027f0ed043065234ce84559a9fc7735a

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