Malicious PDF — malware analysis report

Static analysis result for SHA-256 b9bc51b5ffd50521…

MALICIOUS

PDF

47.3 KB Created: 2021-06-10 22:01:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: aaaa81c05ed3374a113b41120877f878 SHA-1: 55e93d244ca823831eecec661b2b460234d0a937 SHA-256: b9bc51b5ffd50521681428a4303b3b8d93e152afe28fe7a2fdaea47248fc6ee5
142 Risk Score

Malware Insights

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

This PDF file contains numerous links to external websites, many of which are hosted on r2rfurniture.com and appear to be part of a link farm. The primary lure is related to game hacks and generators for popular games like Roblox. The PDF_GAME_HACK_REDIRECT_LURE heuristic and the presence of multiple SEO-optimized PDF links strongly suggest a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/roblox-vehicle-simulator-money-cheat-engine-game-hack PDF link annotation
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-generator-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/lazyblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-20210-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-com-r_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-roblox-premium_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-spin-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-not-a-scam_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-free-hair-on-roblox_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/how-to-get-creative-mode-in-minecraft-server-hack_GM479516143.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-in-app-purchase-hack_GM406889139.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-fan-page-facebook_GM406889139.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/roblox-hacks-on-lumber-tycoon-robux_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/minecraft-building-hacks_GM479516143.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/where-to-get-robux_GM431946152.pdfIn PDF document text
    • http://www.r2rfurniture.com/uploaded_files/userfiles/files/coin-master-free-spins-ios_GM406889139.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_004_off000058e8.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x58E8 25572 bytes
SHA-256: 1d4f90e6d0361a11ebc793d44388027a4baa1dee7629502b7edb5b8c8fd92028
font_01_sfnt_off0000929d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x929D 19600 bytes
SHA-256: 5bf79759467930df42140bb8815db8b95d486f841c6df8e47e8ea7dae87cd30c

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