Malicious PDF — malware analysis report

Static analysis result for SHA-256 3888c6a1a7118a91…

MALICIOUS

PDF

43.7 KB Created: 2021-05-10 21:03:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 671a09637c50b246a0eaf2252810ac6c SHA-1: 1a3e7c6ddd1ca6dfb37db4424beb8dada45c9f0a SHA-256: 3888c6a1a7118a9182a84892649bca65199099e382c14d2f67fb671fa5cde2f2
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 0.9969

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/479516143/is-minecraft-free-on-xbox-one-game-hack PDF link annotation
    • http://stackideas.com/images/free-robux-games_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/coin-master-daily-link_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/can-you-earn-robux_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/coin-master-games-download-free_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/no-scam-free-robux_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/coin-master-el-tiger-card-free_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/robux-best_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/coin-master-cheat-codes-free_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/hack-coin-master-8-ball-pool_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/free-minecraft-account-generator_GM479516143.pdfIn PDF document text
    • http://stackideas.com/images/coin-master-free-coins-and-spins-link-today_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/roblox-devil_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
    • http://stackideas.com/images/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://stackideas.com/images/minecraft-java-edition-free-code_GM479516143.pdfIn PDF document text
    • http://stackideas.com/images/robuxy-com-free-robux_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_off00004db9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4DB9 25812 bytes
SHA-256: 8d2d57f75ab1a00df45b0635cf17492f49adb836d67d405fcc05be624c18b55d
font_01_sfnt_off00008873.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8873 18304 bytes
SHA-256: 19d9535fd2d352d2586ba99854d4ae80d513f2901e16ae506060a78b50b635a9

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