Malicious PDF — malware analysis report

Static analysis result for SHA-256 3216840325a44e34…

MALICIOUS

PDF

43.1 KB Created: 2021-06-03 23:13:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 8bc255288c8fd2d56985f275ccbda405 SHA-1: 2e1e048667656506ae29c2727124c222bd7b265b SHA-256: 3216840325a44e342801fa6f9bebfdf5de6b3d5c32f9f0be338682e05718b8ac
160 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirect lure, pointing to known malicious infrastructure. The embedded URL is a known malicious redirector, and the ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains references to the malicious URL and appears to be part of a social engineering attempt to trick users into visiting a site that likely hosts further malicious content or exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9874

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/www-coin-master-game-hack In PDF document text
    • http://library.persadabunda.ac.id/repository/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-official-website_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/rbx-hut_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/get-coin-master-cards-free_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-person_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-arsenal-hack_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/corn-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/lazy-blocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/can-you-really-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-link-download_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/www-robux-redeem_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/roblox-land-free-robux_GM431946152.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-hack-2021-ios_GM406889139.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/what-is-wurst_GM479516143.pdfIn PDF document text
    • http://library.persadabunda.ac.id/repository/coin-master-free-spins-link-whatsapp-group_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_off00004f00.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F00 24944 bytes
SHA-256: 0878dc153e71ce9b07e51bf5dc073617387d6d3589cb9cdb29a175b624062128
font_01_sfnt_off000086c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86C6 17908 bytes
SHA-256: 6f31903e710e2f0fcec5102e216c8b2505ef46bc9ceeb62cc07342564c5c8e6e

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