Malicious PDF — malware analysis report

Static analysis result for SHA-256 6655451a32c7a261…

MALICIOUS

PDF

45.6 KB Created: 2021-06-14 01:27:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 47883278ab0d42cb9eff4bdb46cf052c SHA-1: 61bc6a938e2c406b8be153fe924db80005392136 SHA-256: 6655451a32c7a26113975814ae51c60b5d11a2fc4218847db4d3f20c0741d879
200 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links to known malicious redirectors and lures users with fake CAPTCHA prompts and 'free generator' text. These elements strongly suggest an attempt to trick users into visiting malicious websites, likely for phishing or to download further malware. No scripts were extracted, but the presence of multiple malicious URLs and the fake CAPTCHA heuristic indicate a high likelihood of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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.
  • 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 http://netcdn.co/app/431946152/free-robux-go-to-robux-gg-free-game-hack In PDF document text
    • http://elibrary.perludem.org/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/wahoogaming-co-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-unlimited-spin-link_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/roblox-promo-code-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/coin-master-hack-2021-android_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/how-to-hack-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-accounts-com_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/woman-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/hack-coin-master-spin-apk_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/get-free-roblox-today_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-hockey-mask-roblox_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-robux-sin-vertificacion_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/rbl-gg-free-robux_GM431946152.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.perludem.org/repository/hack-coin-master-apk-2021_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/roblox-free-catalog-script_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/is-coin-master-hack-safe_GM406889139.pdfIn PDF document text
    • http://www.elibrary.perludem.org/repository/free-roblox-esp-hacks-download_GM431946152.pdfIn PDF document text
    • http://elibrary.perludem.org//repository/coin-master-60-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_off0000485b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x485B 27764 bytes
SHA-256: ae9c56dd5b8753d7b91f7a543fb5de521e2d80ce93ff72024f3368d0a736afb6
font_01_sfnt_off000084bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84BD 2956 bytes
SHA-256: bab8933fc39dc331bc4c1c904a82b1432ab2e02478fa0a59453c98c5c231da8d
font_02_sfnt_off00008edc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EDC 18488 bytes
SHA-256: 15d62499b68f408362218f0e23a0677bba74caea5bb91ae72a0f67b98dfbf1df

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