Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ea586c756c1aea6…

MALICIOUS

PDF

45.8 KB Created: 2021-06-03 05:11:44 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: c8033b7e3e398e42e29b271e79ef27ee SHA-1: 9acda537145b48af4f416cc8f8c30874827ba65f SHA-256: 3ea586c756c1aea65744c345766db8593fdd223f3bf3d9306f3e384d03723c39
220 Risk Score

Malware Insights

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

This PDF document contains a malicious link disguised as a game hack, which is a common lure for phishing and malware distribution. The document also displays a fake CAPTCHA, intended to trick the user into interacting with the malicious content. The presence of malformed exploit streams and ML classification further support its malicious nature, likely leading to the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.online/app/431946152/www-roblox-com-robux-free-game-hack In PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/daily-spin_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-card-collection-hack_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/roblox-sued_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-free-spin-link-twitter_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-game_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/working-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-hack-to-get-free-spins_GM406889139.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_off000051b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x51B3 26968 bytes
SHA-256: a63986e0e045f99020cd06e3259c064a70ffe2f11340ec77862797c5901a2d98
font_01_sfnt_off00008f25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F25 18708 bytes
SHA-256: c91f27fd30ec200e2a0dbd5cc88ad35776bc2371b1b59549651737de5f7a4295

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