Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51d418fdb6bf7f0…

MALICIOUS

PDF

46.4 KB Created: 2021-05-16 11:14:56 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 920d0e1dee642e030d3a05109e18d34d SHA-1: 6764260270c629491eaaa12866f8523c587efba2 SHA-256: f51d418fdb6bf7f004f076a5f6bab2b46798e84370a7a2383fb6ff99f9127692
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a fake CAPTCHA lure, designed to trick users into interacting with malicious links. It links to a 'free generator / game hack' redirector, which is a common tactic for phishing or malware distribution. The document body and embedded URLs suggest a focus on 'free Robux' or game-related scams, likely intended to lead users to a phishing site or a download of unwanted software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

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.xyz/app/431946152/free-robux-not-fake-game-hack PDF link annotation
    • http://linens.kiev.ua/images/free-spins-coin-master-without-survey_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-source_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-much-robux-can-you-get-with-1-million-dollars_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/xray-hack_GM479516143.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-coins-free_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/roblox-studio-free-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/how-to-get-free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/coin-master-free-spins-23-march-2021_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/blox-supply-free-robux_GM431946152.pdfIn PDF document text
    • http://linens.kiev.ua/images/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • http://linens.kiev.ua/images/haktuts-coin-master-free-spins_GM406889139.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_off00004af2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4AF2 25384 bytes
SHA-256: f24be73c0636fc1722ad2957adadd712538cef2fdf1645f4d1a3a787265fdb91
font_01_sfnt_off00008510.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8510 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009222.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9222 18516 bytes
SHA-256: ca79d80576681ece98af22104654f282f19bfdcccdd95bbb76316d29f9029162

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