Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4813fb7a69d0569…

MALICIOUS

PDF

49.8 KB Created: 2021-06-09 15:48:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 043af781e6fde5e4fd59f702e37a4ca5 SHA-1: 7ed298f7c2a5cd552b3e261166c8c6afac195fc4 SHA-256: e4813fb7a69d0569f83285656631a80d9708574e030aecfa35d740b593dca21c
300 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document employs a common lure, presenting itself as a 'free generator / game hack' to entice users into clicking a malicious link. The link redirects to a fake CAPTCHA page that instructs the user to paste or run commands, a tactic designed to trick them into executing arbitrary code. The document's structure and embedded links strongly suggest a phishing or social engineering attack aimed at command execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

Heuristics 7

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Fake CAPTCHA with command-running instructions critical SE_FAKE_CAPTCHA_CLICKFIX
    Document combines fake CAPTCHA or human-verification language with instructions to paste or run a command — a high-confidence ClickFix pattern
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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
  • 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/www-roblox-cheat-us-limite-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-reddit_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-2021-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/tiktok-free-internet_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-fan-page-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-offers_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-robux-without-downloading-apps-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-free-tiktok-followers_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/how-many-levels-are-there-in-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-game-plus-com-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/pokemon-go-free-redeem-codes_GM1094591345.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/coin-master-hack-cydia_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/minecraft-xbox-360-free-download-code_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/hack-rango-99-roblox-phantom-forces_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-roblox-outfits-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/get-free-coin-master_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
font_00_sfnt_off0000500f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x500F 29720 bytes
SHA-256: c9d59f1c73f9aca762d5ea8a742be5991ebb7df6791ac8cedfec81eeb89130ec
font_01_sfnt_off0000930f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x930F 2956 bytes
SHA-256: bab8933fc39dc331bc4c1c904a82b1432ab2e02478fa0a59453c98c5c231da8d
font_02_sfnt_off00009d2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9D2F 19212 bytes
SHA-256: 8e7a5dd24e303c0be15502dbabbf21d0bf5890e0ead405c243cc1c09f261efa6

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