Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0d85bb6bfafb14d…

MALICIOUS

PDF

46.2 KB Created: 2021-06-08 17:39:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 7f16bb124270b09f99c6410f667a20d9 SHA-1: dd3fa55db1b6ec683263a1554f7cdb68c0abeb17 SHA-256: b0d85bb6bfafb14d320626a274bf4bb011b051dedc9fb3f259c6dfb233677f40
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9864

Heuristics 5

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.tw/app/431946152/roblox-bc-hack-game-hack PDF link annotation
    • http://atiltd.com.tw/upload/files/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/best-roblox-hack-tool_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-make-a-roblox-group-for-free_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-hack-no-verify_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/claim-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-person_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/completed-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-college-textbooks-tiktok_GM835599320.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/can-you-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/free-minecraft-java-edition_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-hacks-com_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/how-to-earn-robux-fast_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-trolling_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/roblox-april-fools-hack-face_GM431946152.pdfIn PDF document text
    • http://atiltd.com.tw/upload/files/rewards-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_004_off00004ebf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EBF 29512 bytes
SHA-256: 9b23cfe7bfdf3ccfe104d94b9ae8244dcf4a2e18fd00b359b9187ab3203f5182
font_01_sfnt_off0000924b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x924B 18184 bytes
SHA-256: 80579a7f4a9ef6a32b1714be94c93fa49a6e48551849ec557a56ea4dc22603ad

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