Malicious PDF — malware analysis report

Static analysis result for SHA-256 639135fa9e840201…

MALICIOUS

PDF

43.9 KB Created: 2021-06-03 09:20:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 645b63d0479efeeb5ab6f21c5222a830 SHA-1: 93d0e8eeb0befbcc5bfca69acf2620f554de660f SHA-256: 639135fa9e84020128bf01c4198347287db2b8befb555c17821d846a3366ec88
160 Risk Score

Malware Insights

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

This PDF document employs a lure related to online games and hacks, directing users to a malicious URL. The heuristic firings indicate that the PDF contains malicious redirector links, likely intended to lead the user to a site that downloads a second-stage payload or initiates a phishing attempt. No scripts were extracted, but the PDF structure and embedded links strongly suggest exploitation for client execution.

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.online/app/406889139/coin-master-play-online-free-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/free-minecraft-alts_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/download-coin-master-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spins-promo-code-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-free-download-no-virus_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/pastebincom-roblox-robux-hack_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-giveaway_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/cool-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-change-your-roblox-username-for-free_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-apk-mod-coin-master_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
stream_004_off0000514b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x514B 24608 bytes
SHA-256: 58ae8bf5401f566deeda9e97a266bf00b771f07d781a6e083771cdf07983077c
font_01_sfnt_off000089b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89B0 18116 bytes
SHA-256: 72f8f7809eb4a1b9c73a82838ab37455291baaf1e92adfc73e6524a5848e4fd8

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