Malicious PDF — malware analysis report

Static analysis result for SHA-256 b16ab908807083d6…

MALICIOUS

PDF

35.1 KB Created: 2021-06-24 02:25:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: e4ca622443fe917f3cd07c77ff204f1d SHA-1: d92af9259f5f463154ecd44bbac9b9e96a7f20e4 SHA-256: b16ab908807083d62ccb3f7a5eb1d84f77f4a87f83ee373a5d6047e581daef94
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 http://netcdn.co/app/406889139/free-spins-for-coin-master-2021-game-hack PDF link annotation
    • https://www.advancissurgical.com/uploads/files/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-hack-tools_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/robux-generator-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-a-free-dragon-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-robux-website_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/is-it-possible-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/games-that-give-out-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-pe-free-apk_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/krnl-roblox_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/how-to-get-free-robux-on-roblox-no-verification_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/minecraft-pe-hacks_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://www.advancissurgical.com/uploads/files/files/coin-master-free-spins-link-today-twitter_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_002_off0000315f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x315F 23244 bytes
SHA-256: b34c52e0890509b46c06a088fca502f5d24136f528972455c4322be82848d513
font_01_sfnt_off00006590.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6590 18576 bytes
SHA-256: fb0fb59ed2c1a9034e606a4b9af272ef40c933264071e94cfd5fd7ab3c408864

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