Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd535fba53d0e0cc…

MALICIOUS

PDF

32.5 KB Created: 2021-07-20 20:41:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 2310bb7bb2b09c521ebd81c3cd22a37c SHA-1: e42b171ffd100ecdb77bfb8fc8992bc6cadc3f13 SHA-256: fd535fba53d0e0cc18347c7a700bfbcc2426866ccb15cdb8eae1435426ccb25b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to sites offering 'free generators' or 'game hacks', a common lure for malicious downloads. The heuristic firings indicate the PDF links to known malicious redirector infrastructure and is flagged by an ML classifier. While no scripts were explicitly extracted, the PDF structure suggests potential for embedded JavaScript to facilitate the redirection or download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9900

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 http://netcdn.tw/app/835599320/freer-pro-tiktok-fans-game-hack In PDF document text
    • http://librarysenior.com/repository/tiktok-like-bot-free_GM835599320.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/bux-life-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/free-robux_GM431946152.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-multiplayer-free_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/minecraft-java-edition-free-trial_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • http://librarysenior.com/repository/tiktok-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002de0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2DE0 22056 bytes
SHA-256: e74ef0b335fc2b6ba99937cda1135f00dfcba591579bfc3a3e6d42fb0c6f529a
font_01_sfnt_off00005e79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E79 17836 bytes
SHA-256: b5cd6e44f23342f5814d14ac4a9e66e4145bc6ad622852c2f98f607989fb45e5

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