Malicious PDF — malware analysis report

Static analysis result for SHA-256 4431f37e0ea2e96f…

MALICIOUS

PDF

44.8 KB Created: 2021-05-20 01:37:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 42d9eaa24f18616dee7ffb6520083be3 SHA-1: 1e28b9661cba8924e71deb72a7d36224ad90f838 SHA-256: 4431f37e0ea2e96f8d12389cd384083355b0a43cf2a2a7f7eb01ed6f911b5b83
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 0.9632

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/free-robux-clothes-game-hack PDF link annotation
    • https://www.brainpads.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/minecraft-wurst_GM479516143.pdfIn PDF document text
    • https://www.brainpads.com/images/minecraft-pe-free_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/no-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-hack-root_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/free-games-coin-master_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/robloxheroxyz-free-robux_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/getrobux-come_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/robloxfun-com-generator_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • https://brainpads.com/images/is-roblox-free-on-xbox_GM431946152.pdfIn PDF document text
    • https://brainpads.com/images/coin-master-free-spins-youthnow_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/roblox-hax_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/500-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.brainpads.com/images/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.brainpads.com/images/free-800-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000047de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DE 25520 bytes
SHA-256: bb7ae0fd7a36eeaf3c42b1b17be42095f1af492a6554957c842b028ec68f9a6e
font_01_sfnt_off0000825f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x825F 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008c49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8C49 18360 bytes
SHA-256: a1d18e52fe431c3fa184e800cbb116f4a676a51d8f231eb3c7a40e64f11ea3a2

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