Malicious PDF — malware analysis report

Static analysis result for SHA-256 478c142dfaa8a2d1…

MALICIOUS

PDF

45.6 KB Created: 2021-05-20 03:42:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 744d9e76d4a3068d4184bcc63be834c8 SHA-1: 27f28180b1f84227186e8ae3159a104e91993524 SHA-256: 478c142dfaa8a2d1b0cce4926cbde2a5616ae410da4857373680717cb67d5072
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 0.9507

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-giveaway-game-hack PDF link annotation
    • http://www.sbairs.com/datas/files/coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-robux-wheel_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/does-roblox-premium-expire_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-clipart-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-free-spins-and-cards_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-game-free_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-unlimited-spins-apk_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/roblox-play-as-guest-free_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/minecraft-classic-free_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/free-24-7-minecraft-server_GM479516143.pdfIn PDF document text
    • http://www.sbairs.com/datas/files/is-minecraft-education-edition-free_GM479516143.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_off00004aef.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AEF 25452 bytes
SHA-256: 5ef8c5b0c15a1fda130f6ab0933de3d797d4af43b3bc4bd5b8fb8094127f32fa
font_01_sfnt_off0000843b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843B 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off00008dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DEA 18820 bytes
SHA-256: a907981f6338d23acda294c558170907db38f399f16fdb2ca0bc536a0b707f6d

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