Malicious PDF — malware analysis report

Static analysis result for SHA-256 1683daaeffe88e08…

MALICIOUS

PDF

34.6 KB Created: 2021-07-04 00:16:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: de3216d22b69e09bf67aa7f1cb99aeaf SHA-1: 7e2fc7c361e6a0f56209fe3629e650ae173fefbf SHA-256: 1683daaeffe88e0863457174f8a8f1a1b2f42f77a6e58a13575572be647710d7
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple invisible links and visible calls-to-action that lure users towards websites offering 'free Robux' and game hacks. These links predominantly point to malicious redirectors and CAPTCHA pages, indicating a phishing or scam attempt. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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 http://netcdn.tw/app/431946152/free-robux-master-game-hack In PDF document text
    • http://lib.kunci.or.id/repository/minecraft-modded-client_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-hack-in-roblox-prison-life-v20_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/robux-cheap-cheat_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-32-hack-apk_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-free-robux-without-captcha_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-to-get-stuff-for-free-roblox_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/wwwcoin-master-free-spincom_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/toolbox-for-minecraft-pe-ios_GM479516143.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-free-level-7-exploit-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/roblox-hack-wizard-tycoon-2-player_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.kunci.or.id/repository/hacking-in-roblox-phantom-forces_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
font_00_sfnt_off0000311d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x311D 22112 bytes
SHA-256: ead25eb8a20943d7d9c76a50c32e9f3b621ea138350f1e4b672ff55ba1b6b388
font_01_sfnt_off00006236.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6236 19016 bytes
SHA-256: 0711aa3722a358e6535bb0e0d6488ab3bb261fec109fcb3e968137a95c51a284