Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc61b6458b8a84b0…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 11:21:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7227579266d4e916ae16e9c06e3d11c2 SHA-1: e8b9275f57fc1c3c88f84ccafe4b973d4b37e5f2 SHA-256: dc61b6458b8a84b00eb70b858f96319e41481552613e911b7406d091840a63dd
200 Risk Score

Malware Insights

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

The PDF document presents a fake CAPTCHA and a download button to lure users into clicking malicious links. These links redirect to known malicious infrastructure, suggesting the document is designed to deliver a second-stage payload or lead users to a phishing site. The ML classifier strongly supports the malicious verdict.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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/mobihack-net-roblox-hack-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-18-9-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/robux-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-link-facebook_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-online-hack-link_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-promo-codes-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-hack-free-spins_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-hacks-on-minecraft_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/minecraft-images-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/kuso-icu-roblox-hack_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-minecraft-for-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/play-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/apocylopse-rising-roblox-hacks_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-army-free-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004f6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4F6D 27544 bytes
SHA-256: ac5c7d4f431297b0d6c11c6e71d00e2a4c2f784d8ee457ce30a05fe5414a7483
font_01_sfnt_off00008df9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DF9 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009b0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9B0B 18768 bytes
SHA-256: 4038ce5e3e0945c6cd976405ec29b4e5783f739c83bcd68413f286c6b350b233

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