Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa650ec4b87ce185…

MALICIOUS

PDF

40.5 KB Created: 2021-05-01 07:55:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 44516749150f7c3e82c330bd9187f594 SHA-1: 90d1efcc5393d1be2563179553a2c08874039335 SHA-256: fa650ec4b87ce1852746d2b8ba962ced0512a76b5d9af3766108d5083cd010e9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically designed to lure users with promises of game hacks or generators for Roblox. The document body, though heavily obfuscated, contains references to these lures and embedded URLs. The presence of multiple malicious redirector links and the ML classification strongly indicate a malicious intent to lead users to potentially harmful content or further exploits.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9941

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.xyz/app/431946152/roblox-shirt-hacker-game-hack In PDF document text
    • https://fridaytravelnepal.com/userfiles/files/rbxf-free-robux.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-promo-codes-roblox-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-raindrop-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/do-you-want-free-robux-get-unlimited.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/dinosaur-simulator-roblox-hacks.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-denis-shirt-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/free-obc-roblox.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/how-to-get-free-clothes-on-roblox-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/all-free-promo-codes-in-roblox-2021.pdfIn PDF document text
    • https://fridaytravelnepal.com/userfiles/files/roblox-speed-hack-2021-pet-simulator.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_off000041e0.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x41E0 25660 bytes
SHA-256: b2154ea0f2142face516b95c31044370d4184eb4f9de81515d51d6330787e7ed
font_01_sfnt_off00007bb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7BB2 18572 bytes
SHA-256: e821eebdaa4056668d1201f7b41c843b92543bbc3170b47af4d7a30dea738e2b