Malicious PDF — malware analysis report

Static analysis result for SHA-256 b0321293cc6eff25…

MALICIOUS

PDF

45.5 KB Created: 2021-06-09 00:12:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 5972c7ec674fdc2ed905bdd4442efcd1 SHA-1: 7c3411f67385dc2840dfa6351328a006ff9aaf02 SHA-256: b0321293cc6eff25947b8058e507c2615a87abf680d776c5af56a09d4b397b7c
142 Risk Score

Malware Insights

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

The PDF document contains a fake CAPTCHA lure, designed to trick users into clicking on numerous embedded links. These links, such as 'https://netcdn.tw/app/431946152/good-free-roblox-clothes-game-hack' and others hosted on 'sbm-nn.ru', likely lead to scam websites offering game cheats or free items. The document's structure and content strongly suggest a phishing or scamming attempt, leveraging social engineering to drive traffic to malicious or deceptive sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/good-free-roblox-clothes-game-hack PDF link annotation
    • http://sbm-nn.ru/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-speed-hack-download-2021_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/roblox-help-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-free-link-blogspot_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/coin-master-hack-here_GM406889139.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-free-download-iphone_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/como-tener-los-hacks-de-xonnkek-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-apk-download-v1-144-2-free_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/free-minecraft-addons_GM479516143.pdfIn PDF document text
    • http://sbm-nn.ru/images/pubg-uc-buy-in-pakistan_GM1330123889.pdfIn PDF document text
    • http://sbm-nn.ru/images/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://sbm-nn.ru/images/minecraft-windows-free_GM479516143.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_off000050ed.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50ED 27604 bytes
SHA-256: 48d2c3640f38973c9884e1b008bae9bd50ec282d600e0b0b8ad0188e09235e7e
font_01_sfnt_off00008f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F05 18392 bytes
SHA-256: 126592010086aef51e2607446bcc31a02e428338181d4d4bcff816968c66b350

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