Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf39f4dea0c49091…

MALICIOUS

PDF

45.6 KB Created: 2021-05-15 04:07:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: d0b809810b77c84f95618c35b605dd61 SHA-1: 0678d1f1aaeae331472eeb4cd6dbe6052490026c SHA-256: cf39f4dea0c490915b1ab62bd17a15b19b4c1cac3def9ab4f062d7ad99eac55f
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 https://netcdn.xyz/app/431946152/is-there-any-way-to-get-free-robux-game-hack PDF link annotation
    • http://skwolcott.com/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/minecraft-free-exe_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/coin-spin-link_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-spins-coin-master-android_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/get-me-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/games-for-robux_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/coin-master-support_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://skwolcott.com/images/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://skwolcott.com/images/play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://skwolcott.com/images/free-robux-master_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_003_off000049eb.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49EB 31016 bytes
SHA-256: c9e6de9d04a35746f05cfe448e3defec1df40f65a515b6351b53f37ba48898b8
font_01_sfnt_off00008e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E3F 18892 bytes
SHA-256: d4b621edf5ac5f073c5a65dd804db4f1f2ad13c123c1b5ace541ce5f5c284f58

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