Malicious PDF — malware analysis report

Static analysis result for SHA-256 44c1890d9f307e8f…

MALICIOUS

PDF

33.9 KB Created: 2021-06-27 08:47:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6d696035036c1d0448428aaf0e19fcf9 SHA-1: 7fac6f45ecd1bb4789bde4d4a4b71cb533f0d27a SHA-256: 44c1890d9f307e8fa4c19379c6d4e929da4bbea088f8656d61f67bbc9c34384a
102 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links and a primary URL, all related to generating free in-game currency for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm designed to attract users searching for cheats or hacks. The ML classifier also strongly flagged this PDF as malicious. The presence of a download button lure further supports the malicious intent of directing users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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.
  • 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.co/app/431946152/robux-free-generator-unlimited-robux-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/hackear-coin-master-sin-verificacion_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-hack-nopde-engine-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-hack-game-download_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/hack-robux-roblox-2021-funciona_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/cant-make-my-items-free-in-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-today-daily-links_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-coins-app-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-hack-2021-no-verification_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-skyscraper-tycoon-hack-script_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/retail-tycoon-roblox-cheat-engine_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/yt-como-hackear-dragon-ball-galaxy-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-minecraft-mods-for-xbox-one_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-bux-free_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/hack-roblox-egg-farm-simulator_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/roblox-stamper-tool-hack_GM431946152.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_off00002e47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E47 21736 bytes
SHA-256: 788b8e90bcf3cdf0849f57a4bbfdb72870c2039e0404a1839a4e6dc4d04ba42a
font_01_sfnt_off00005e25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E25 19448 bytes
SHA-256: ca9ebb0cc06af19a65beed9b50615405b575125e265dee4032b5d0ceef16a603

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