Malicious PDF — malware analysis report

Static analysis result for SHA-256 644e1d56ac6d57c4…

MALICIOUS

PDF

44.4 KB Created: 2021-06-03 13:22:07 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: d53af119c22137ba59eb999b47c9e5b7 SHA-1: 7f7e79ab9434122c6312bee98572ca5e5a3f0f53 SHA-256: 644e1d56ac6d57c4ec20ecbbce188fa7217858d4ca360b1ccf191bb75d5e300b
160 Risk Score

Malware Insights

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

The PDF contains multiple links to external websites, including a known malicious redirector at 'https://netcdn.online/app/431946152/roblox-script-hacks-game-hack'. These links are presented as lures for game hacks and generators, suggesting a social engineering tactic to trick users into downloading or executing further malicious content. The ML classifier also strongly indicated maliciousness.

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/431946152/roblox-script-hacks-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-gun-free_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-svg-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-15-free-spin-link-of-last-5-days_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-robux-working_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-gift-card-codes_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/are-pubg-uc-cheap_GM1330123889.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-minecraft-windows-10-account_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-can-i-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-flip-master-coins_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-hack-in-roblox-prison-life_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-34-5-hack_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-java-free-download_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-arsenal-hack-script-money_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-hacks-wurst_GM479516143.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_off00005127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5127 24792 bytes
SHA-256: 6470abeb6ee562155c3e6489df53a7a331357dfca233c2eec7e00b1df70f5a23
font_01_sfnt_off000089bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89BB 18580 bytes
SHA-256: 535ec4be0d2657e9981f9200dcc4c4c41f6589372ce54f218017d5d6a2e1f0f5

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