Malicious PDF — malware analysis report

Static analysis result for SHA-256 05f61e6a15c618b6…

MALICIOUS

PDF

42.2 KB Created: 2021-05-13 14:41:26 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b81e1365a591c27c6bb3ec8451010867 SHA-1: 2bd1c1dca15bf2e8f517be2d959076e29803bacd SHA-256: 05f61e6a15c618b683ca032b0ed28bf116c00bc8d8d1790513d4795f768957c7
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 0.9971

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/how-to-get-free-robux-not-a-scam-game-hack PDF link annotation
    • http://stroybelan.ru/images/instant-robux_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/free-robux-safe_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/www-rubux_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/boku-no-roblox-hack_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/how-to-get-free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/how-to-hack-peoples-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/minecraft-hacks-ps4_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/roblox-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/free-coin-spin_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/roblox-free-roblox_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/minecraft-pe-016-0-apk-download-free_GM479516143.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-hacks-xyz_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://stroybelan.ru/images/coin-master-heaven-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://stroybelan.ru/images/buy-robux-free_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_003_off00004674.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4674 25380 bytes
SHA-256: 46d284e38bd820bd27583d1c5f1776b5ddb8cb69609554d97ef52ac2e0b1b428
font_01_sfnt_off000080ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80ED 18768 bytes
SHA-256: 022361ef70d0601eb321de045a15355e0ef134abc2a3262f50e5e6000d82738d

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