Malicious PDF — malware analysis report

Static analysis result for SHA-256 2423e94d10eee21c…

MALICIOUS

PDF

41.9 KB Created: 2021-06-03 12:14:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: eb493171bfc1a51e8b69654b3c11b5a5 SHA-1: 8cd18c1e01c71a089863f49755b56da410c15102 SHA-256: 2423e94d10eee21c5f6d0d627d9d98271c8768bec396688102875c88ecc0c989
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to a malicious URL, identified as a 'free generator / game hack' lure. The presence of embedded URLs and a critical heuristic firing for malicious redirector infrastructure indicates a phishing or scam attempt. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lead the user to a malicious site, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • 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/835599320/tiktok-free-upload-game-hack In PDF document text
    • http://lib.untad.ac.id/repository/robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/robux-hack-tools_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/robuxmatchcon_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/what-do-roblox-points-do_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/spins-gratis-coin-master-hoy_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-robux-games-that-actually-work-2021-links_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/how-to-get-minecoins-in-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/coin-master-heaven-free-spins_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-coins-and-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/pokemon-go-free-walk-ios_GM1094591345.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-coin-master-stuff_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/earn-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/free-spins-for-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/free-tiktok-fans-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
    • http://lib.untad.ac.id/repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.untad.ac.id//repository/500-free-coin-master-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
stream_004_off00004c63.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C63 23184 bytes
SHA-256: f3ec86652e2f126f0344059b52fd9f962e77b12125dca6e6da696fc5ba9d7fcb
font_01_sfnt_off000080dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x80DD 18296 bytes
SHA-256: a2f8fdbfe2a188eb3ed6bf4c732e3db68bcbd3c6850ecd93dd78ce96cf63902e

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