Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f44c98bf150301…

MALICIOUS

PDF

34.2 KB Created: 2021-06-26 19:23:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 579bfa78414bd5ec7e2169e93da9098b SHA-1: fc30a500587c50528c1a48f7a75d34155011df6e SHA-256: 56f44c98bf1503013255dde9dae601b414d0974388208d7e02c3d76008ad7869
142 Risk Score

Malware Insights

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

The PDF contains numerous invisible links, many of which are disguised as CAPTCHA challenges or download buttons, leading to external websites. The document body and extracted URLs suggest a lure for free Robux or game-related cheats, indicating a phishing or scam attempt. The ML classifier strongly supports the malicious verdict.

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.
  • Invisible PDF links to CAPTCHA-themed web lure high PDF_CAPTCHA_LINK_LURE
    PDF contains invisible clickable link annotations that point to a CAPTCHA/capcha-themed web path. This is a common phishing and ClickFix-style routing pattern: the PDF itself is inert, while the linked page performs the credential prompt or fake verification.
  • 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/este-este-unico-hack-que-te-da-robux-game-hack PDF link annotation
    • https://pustaka.widyakartika.ac.id/repository/minecraft-mojang-free_GM479516143.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/easy-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-and-builders-club_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-inject-dll-roblox-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-with-recapcha_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-400-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spins-on-coin-master-iphone_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-get-free-spins-grom-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-one-piece-millenium-hack-devil-fruit-esp_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-promo-codes-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/how-to-hack-someone-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/roblox-restaurant-tycoon-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://pustaka.widyakartika.ac.id/repository/free-100-robux_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_off00002f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F1C 21992 bytes
SHA-256: 5c98101b8b32faada0e92a33075ad76b52dc3ad77520c120b8887af17a4da286
font_01_sfnt_off00005fe0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5FE0 19272 bytes
SHA-256: 925552fad0b5e51ef1bc4258b838104d23aa2b54bf079f81d4fc3b15d28a9fc3

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