Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf35f9e912789c18…

MALICIOUS

PDF

48.6 KB Created: 2021-05-15 08:31:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 8ec4e9db3a29be95b56c404c4e1ed314 SHA-1: 5e2399690b4d4c726feb5fb610540da0c6bc456b SHA-256: cf35f9e912789c18f6daccca582bc87f13b0fcbb45a3d7c5da4c9ee82f72d6cf
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The document presents a fake CAPTCHA to trick the user into interacting with it, likely to initiate a download or exploit. The presence of multiple URLs, including one pointing to a 'roblox-robux-generator-game-hack', suggests a phishing or scam attempt. No scripts were extracted, but the ML classifier and fake CAPTCHA heuristic strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • 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.xyz/app/431946152/roblox-robux-generator-game-hack PDF link annotation
    • https://allpromise.com.tw/image/data/files/coin-master-free-soins_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/www-free-robux_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-card-hack-2021_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/robux-survey_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/gamesofficenet-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/roblox-earn_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/how-to-give-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-free-spins-2021-blogspot_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/coin-master-village-cost_GM406889139.pdfIn PDF document text
    • https://allpromise.com.tw/image/data/files/roblox-free-robux-website_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_off00004c8e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C8E 27756 bytes
SHA-256: ab633c77cc17d7024ef09f2a038f8ae753c854a2448f50217698b4131bea5a38
font_01_sfnt_off000089b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B0 7448 bytes
SHA-256: a76ff9b4805dcff342f7268a16e2e3c2ff2b31b96c381fe4deb6ceea777bce90
font_02_sfnt_off00009b93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B93 18256 bytes
SHA-256: 5ee160adc2cd2b50f67dfe0d7652360e6cad44731d7ae2e4db544c54b4fa7397

Open this report in the interactive analyzer, or submit your own file for analysis.