Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5cbea98d5a3bd13…

MALICIOUS

PDF

34.8 KB Created: 2021-07-08 01:01:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 499431255ad82a7cfd8d74eaccf95389 SHA-1: cc4969acf8b443237de3950b1bf80b895ed17b1e SHA-256: b5cbea98d5a3bd13b2a8c2bdeb224c8ad7211be6c67f57cac60bde55ddf6db6e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator / game hack' lures. The presence of these links and the ML classifier's high confidence score indicate 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 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/431946152/how-can-you-get-free-robux-game-hack In PDF document text
    • http://digilib.stiki.ac.id/repository/coinmaster-spin-ml-free_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/robux-hack-500m_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-hack-into-drtraybloxs-account-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-to-get-free-robux-no-hacks-gliches-or-troll_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-free-fgteev-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/wwwget-free-robloxcom_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/roblox-parkour-how-to-use-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/how-can-you-get-free-robux_GM431946152.pdfIn macro / runtime command snippet
    • http://digilib.stiki.ac.id/repository/roblox-promocodes-2021-free_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/android-coin-master-3433-apk-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/box-prizes-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.ac.id/repository/hack-roblox-dragon-ball-rage_GM431946152.pdfIn PDF document text
    • http://digilib.stiki.acIn macro / runtime command snippet
    • 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_off00002ec3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2EC3 23048 bytes
SHA-256: 1386f688369e949b4a7e5c508e7d921729ae67f01be829f52e18392e3f009146
font_01_sfnt_off0000629e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x629E 19144 bytes
SHA-256: 8668bba6b571f2ff0c38dc1335afffc5959d5ef775e0221b19e79d7de012f826

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