Malicious PDF — malware analysis report

Static analysis result for SHA-256 236840bc5e3d79bc…

MALICIOUS

PDF

33.2 KB Created: 2021-07-06 06:07:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: cbe17331ec2553fc0e52fe1ff2aa7198 SHA-1: f710d1a52f271565d651af6c874a1192a03aa701 SHA-256: 236840bc5e3d79bccc8c7d9378d34f719301cce8f2c2b48d95e5bbc19b5c8590
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with link farms and SEO manipulation. The primary lure appears to be 'free game hacks' or generators for popular games like Minecraft and Roblox. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a malicious workflow. The document's purpose is to redirect users to potentially harmful sites.

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/479516143/is-minecraft-realms-free-game-hack PDF link annotation
    • http://digilib-unirow.ac.id/repository/roblox-noclip-jailbreak-cheat-engine_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/is-pokemon-go-free_GM1094591345.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-coins-links-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/apps-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/robux-generator-com_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-coins-link-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/hack-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-and-coin-link-today_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/synapse-roblox-free-download-2021_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/minecraft-hacked-apk_GM479516143.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-get-free-robux-on-guuuddinfo_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-someone-hacked-my-account-and-traded_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/roblox-free-accounts-rs_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/free-spin-codes-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/how-to-do-the-hack-in-lab-experiment-roblox_GM431946152.pdfIn PDF document text
    • http://digilib-unirow.ac.id/repository/coin-master-free-spin-link-app_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_off00002e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E1F 22324 bytes
SHA-256: 706d134b30f646366a480dca8d046091f7d7f84c28eb66c2b2af079c7f3358aa
font_01_sfnt_off00005f9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9C 18192 bytes
SHA-256: 3fdf6c7900c76153a6c8ba7010afe065a028b37808fae2d556e2bfe86359ad32

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