Malicious PDF — malware analysis report

Static analysis result for SHA-256 d56e0b2f89c64498…

MALICIOUS

PDF

44.6 KB Created: 2021-05-11 23:30:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 91cd465ec58cd178ea96df5e63ceee4d SHA-1: 3548e3225060cfd65f66f8c2c659218a6187cb16 SHA-256: d56e0b2f89c6449826c2617e596da5870130706dbf9defd505a158772326d23f
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are presented as 'game hacks' or 'free currency generators' for popular games. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of such links, suggesting a malicious attempt to drive traffic to potentially harmful sites. The ML classifier also strongly flagged this PDF as malicious. The primary attack pattern involves luring users with promises of free in-game items, likely leading to phishing pages or malware downloads.

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 https://netcdn.xyz/app/431946152/how-do-u-get-free-robux-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/robux-premium_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-hack-client-download_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spins-link-2021-app_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/no-human-verification-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-spins-and-coins-coin-master-facebook_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-free-minecraft_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-coins-and-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-roblox-svg_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-spin-link-today-16-11-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-pet-food-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-robux-hack_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-gift-card-codes-2021_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/roblox-games-that-give-you-free-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
stream_003_off000049ff.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49FF 28440 bytes
SHA-256: c6b2cdbf4c33efd5724e9c691faae4275cabaa45d2e4bf4d86e527c2656219e9
font_01_sfnt_off00008b0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B0F 18636 bytes
SHA-256: ab6f51fdb1eed883fd21dff3bd0336e3a1b816e6c21a8924207bfe84ed9a007e

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