Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b86e3724e2fb51f…

MALICIOUS

PDF

37.3 KB Created: 2021-07-04 18:06:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: c92fb3e27a99f0e924e8de3c04e37ba2 SHA-1: 15ad02b7169ed372fc989b4ca8ca4e7813af251f SHA-256: 1b86e3724e2fb51f43a782ab36bb9651ae9f778e7539a446c53b97f57b5a2585
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are SEO-optimized to appear as legitimate resources for game hacks and free in-game currency. The primary lure is 'free Robux', a common tactic in phishing and scam campaigns. While no scripts were explicitly extracted, the PDF structure and extensive link farm suggest a malicious intent to redirect users to potentially harmful sites, likely for credential harvesting or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-robux-only-username-no-human-verification-game-hack PDF link annotation
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-git-free-privert-servers-in-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/cheat-codes-for-call-of-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-free-codes-in-roblox-bee-swarm_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-roblox-shiny-charm-for-pokemon-brick-bronze_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-free-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-hacks-strucid-aimbot_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-robux-hacks-that-actually-work_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-robux-for-pressing-the-button_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/hacks-roblox-menu_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/roblox-bee-swarm-hack-for-treats_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/pubg-uc-2021-trick_GM1330123889.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-bedrock-hacks_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/nelson-diamant-hack-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/how-to-get-more-robux-for-free_GM431946152.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • http://perpus.ftunismabekasi.ac.id/repository/hack-coin-master-site-rssingcom_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_off00003964.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3964 22380 bytes
SHA-256: bbe02892e4a450594ea1a0d84d1ac419ce7b36dc96ff1c71a9b1fe82a96020cd
font_01_sfnt_off00006b5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6B5A 19588 bytes
SHA-256: 2aa3163e32aa61887c262fca8289404382398ed533c0aa8410485c934e17860b

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