Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a7a89eaf36edf6…

MALICIOUS

PDF

46.2 KB Created: 2021-06-09 04:06:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 77b8fa285c1e74a6bc9a41b92e38e8ef SHA-1: 6d97d74deffd5712a81dd8942c010d1c8df027ff SHA-256: 58a7a89eaf36edf661777c98febc5077ec21393a2a209499236ea8def2e3a997
200 Risk Score

Malware Insights

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

The PDF contains multiple links to redirector infrastructure, specifically pointing to a lure for game hacks and generators. The document body and heuristics indicate a fake CAPTCHA or human verification prompt, designed to trick users into clicking the malicious link. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/roblox-profile-picture-free-to-use-game-hack In PDF document text
    • http://repository.unla.ac.id/repository/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-to-play-minecraft-servers_GM479516143.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-do-i-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-android-2021_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-coin-master-spins-and-coins-for-daily_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-comroblox_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/roblox-coloring-sheets-free_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-hack-apk-link_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • http://repository.unla.ac.id/repository/coin-master-free-spins-app-android_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
stream_004_off000052ec.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52EC 26240 bytes
SHA-256: 9b4829d8ef79e37f16db0fdd41f9faa970a083107dc41ce043c15cf7b8e7da24
font_01_sfnt_off0000914e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x914E 18652 bytes
SHA-256: 619db997cea03b53302c1bb8074ff390ade91feb87a7568602305fd26f455a88

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