Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d822fc637be7cb6…

MALICIOUS

PDF

42.6 KB Created: 2021-05-19 01:39:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: a8656bdf77f0e2488e135af3a99f585f SHA-1: dcf78afcab4d62ba9b04936bfce17cd23e63bd18 SHA-256: 3d822fc637be7cb6b773c3674095438d224b4fac361824ab0ecd1677f76d4310
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 0.9971

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 https://netcdn.xyz/app/431946152/rewardrobux-com-game-hack PDF link annotation
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-apk-hack_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-hack-2021-iphone_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/win-free-robux_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-get-minecraft-java-free_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-free-followers_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/clean-master-free-coins-and-spins_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-printable-minecraft-coloring-pages_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-spins-coin-master-2021-hack_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/daily-coin-master-free-link_GM406889139.pdfIn PDF document text
    • http://niceviaapia.com.br/images/ckfinder/files/free-coin-spin-coin-master_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_003_off00004885.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4885 25128 bytes
SHA-256: 95ff014c3f97f1259905f2d8cb41236b7d6e7fc4adbe59d610cf6144a593519f
font_01_sfnt_off000082ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x82CA 18676 bytes
SHA-256: 7669e564bd091b207fd11e388173a1fc76ed62ef873f42ab23981861f0020ac0

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