Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36279a6905c8e03…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 11:54:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 05cfabfb082492dbe7a513060c5b16e7 SHA-1: ebfb1570bf5ac52d6519e72544d9bdb8bad83a21 SHA-256: f36279a6905c8e03ceb78ff393578b2fe29785e53c57bf50a56a3a235ac4a10b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for linking to a malicious redirector disguised as a game hack generator. The embedded URL, 'https://netcdn.online/app/431946152/how-do-i-get-free-robux-on-roblox-game-hack', is the primary indicator of this lure. The document body, though partially obfuscated, contains text related to 'Free Robux' and the malicious URL, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9748

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.online/app/431946152/how-do-i-get-free-robux-on-roblox-game-hack In PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hacks-for-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/get-free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-blogspot_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/bp-to-uc-pubg_GM1330123889.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/robux-free-gift-card_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/earn-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/roblox-hacking-website_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spins-link-blogspot-2021_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-hack-to-get-free-spins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/minecraft-windows-10-edition-free_GM479516143.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/martian-lettuce-coin-master-free_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-spin-link-in-coin-master-game_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/coin-master-free-spins-and-free-coins_GM406889139.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-ways-to-get-robux_GM431946152.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/tiktok-free-tiktok_GM835599320.pdfIn PDF document text
    • https://lib.btkljogja.or.id/repository/free-minecraft-skin-packs_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000050d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x50D4 24528 bytes
SHA-256: 8384e9f2117cd891f75d1035acbe6fc30335ebef50e4269b850fa914486abad1
font_01_sfnt_off00008965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8965 2824 bytes
SHA-256: 1d0cb1023eaa225682b8e7a2c8df4e4c96545ba7eedaf3d9844e51183e9ca189
font_02_sfnt_off00009312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9312 18524 bytes
SHA-256: 4ccd670e6a0bad46446eeab730d71d218c542e1f5d690955267ad9a8693a3722

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