Malicious PDF — malware analysis report

Static analysis result for SHA-256 d48e67bd4cda045c…

MALICIOUS

PDF

45.1 KB Created: 2021-06-07 06:17:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e28efdb49fa2e15b942a54f5366d663e SHA-1: e1736460ea7752a4dcce28619cba69a07e75af1b SHA-256: d48e67bd4cda045c4b85df140b716db86cd56846bd795996b56e647c0ef79ecc
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as 'game hacks' or 'free followers'. These links likely serve as a lure to download further malicious content or phish for user credentials. The ML classifier also strongly indicated maliciousness, supporting the observed redirector behavior.

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.tw/app/431946152/hacker-commands-roblox-game-hack In PDF document text
    • http://digilib.stimlog.ac.id/repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/smart-lodhi-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-followers-on-tiktok_GM835599320.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/robux-no-survey_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/free-spin-app-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/pubg-uc-key_GM1330123889.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-net_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-facebook-hack_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/coin-master-daily-free-spin-app_GM406889139.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/coin-master-hack-without-verification-or-downloading-apps_GM406889139.pdfIn PDF document text
    • https://digilib.stimlog.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stimlog.ac.id/repository/hack-robux_GM431946152.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_off00004f2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F2D 27312 bytes
SHA-256: 5823bd156d2fdbe589983d0eded302be73b0be026d719fd6055f9d6fe16c6408
font_01_sfnt_off00008ccd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CCD 18616 bytes
SHA-256: 7246c85a73203947bb9bbee5b692ef7fc373b50ab11a2ec9789195920f8db30f

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