Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f1f5f4ce90e9b94…

MALICIOUS

PDF

32.4 KB Created: 2021-07-05 23:19:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 2a9593910339fec0c346834ebc7f7706 SHA-1: 51648d51ce33c8daf799190be2b9fc7d3d6dab0c SHA-256: 8f1f5f4ce90e9b949180bf530e9b8859eaee4b873f6a463a8e3c1bb045fa578b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector infrastructure. The primary lure appears to be a 'free generator / game hack' for Minecraft, directing users to http://netcdn.tw/app/479516143/minecraft-win-10-free-game-hack. This suggests a phishing or scam attempt designed to lead users to potentially harmful websites. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/479516143/minecraft-win-10-free-game-hack In PDF document text
    • http://library.umla.ac.id/repository/robux-place-rewards_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-hacktman_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-coins-coin-master-link-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-how-to-get-a-free-dominus-hat-2021-australia_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/hack-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/toolbox-for-mcpe_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-hacks-for-android_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-tiktok-likes-no-verification_GM835599320.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-raid-link_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/are-robux-generators-safe_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-link-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spin-link-new_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-2021-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-robux-by-just-joining-game_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/add-free-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-hack-tool-generator_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-mster-free_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_off00002c81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C81 21592 bytes
SHA-256: bb37571d5ae80ba619959525dc8ed34dd4948f6df9e10ac58433ab3669aae064
font_01_sfnt_off00005b9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9E 18332 bytes
SHA-256: 2667ef4f1bdb9f9e80c1ddc6ef1b3c1413db385f3d009821d42e638d8c3a78c3

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