Malicious PDF — malware analysis report

Static analysis result for SHA-256 43d1273155600cb1…

MALICIOUS

PDF

34.2 KB Created: 2021-07-03 15:26:40 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 0c0504a631b55c297356a83485383715 SHA-1: aca204f2475418f77f7c74d9686e40accd5c5b7e SHA-256: 43d1273155600cb1d5d4258e8f0037fe193c35ed7abf574ac686d18bd8b0e832
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free currency' lures. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button heuristic further supports a deceptive workflow. Although no scripts were extracted, the document's structure and embedded URLs indicate an attempt to trick users into visiting malicious sites, likely to download further malware or engage in credential harvesting.

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/431946152/roblox-free-robux-game-hack In PDF document text
    • http://perpus.stihpada.ac.id/repository/500-rebirths-at-a-time-hack-magnet-simulator-roblox-script_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-free-font_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/mcpe-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/can-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-daily-bonus-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/easy-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/roblox-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-robux-microsoft_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/how-to-get-free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/robux-hack-client-download_GM431946152.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/pokemon-go-free-cheats_GM1094591345.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stihpada.ac.id/repository/free-coin-master-spins-for-today_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_off00003051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3051 22092 bytes
SHA-256: 029159089a581aa2b8b491bc83f0cb7d63cc45962d77a07d81365d7d2929a892
font_01_sfnt_off00006162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6162 18788 bytes
SHA-256: 240f26960413d3375b32b54d3a16c3eb3bd7324ec8649811f17e0fe1da2802cb

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