PDF malware analysis — malicious · 5921be0a8f4b399b

MALICIOUS

PDF

34.1 KB Created: 2021-07-03 10:32:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26

MD5: b4acfca86da7fde610e90f246d390e6e SHA-1: 78b0b1981771770291215984a4c49a9623a6c4ce SHA-256: 5921be0a8f4b399bd77a9cccaff8f021b78a252f0c643b6952a43d14336a841c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising 'free Robux' or 'Coin Master' cheats. The document body and heuristics indicate a lure for game-related exploits, directing users to the URL http://netcdn.co/app/431946152/code-free-robux-game-hack. This suggests the file is part of a phishing campaign designed to lead users to potentially malicious websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/code-free-robux-game-hack In PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-spin-no-offers_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/free-roblox-rigs_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/free-spins-coin-master-cheats_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/www-robux-redeem_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/coin-monster_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-unlimited-spins_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/robuxhackjs_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/how-to-get-free-robux-in-2021_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/how-to-hack-surf-on-roblox_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/coin-master-free-coins-link_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/roblox-promo-codes-free-items_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/coin-master-hack-programers_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/free-coin-master-coins-2021_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/roblox-ultimate-driving-cheat_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/unlock-all-guns-in-roblox-phantom-forces-hack_GM431946152.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
- https://www.nordicstar.co.uk/uploads/files/files/robux-hack-generator-no-veriy-100_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.

Filename	Kind	Source	Size
`font_00_sfnt_off00003093.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3093	21832 bytes
SHA-256: `2f36458ecf3e110b6c1653c8ef5750a925dda009d3a2500af0dfa9d58ef0c996`
`font_01_sfnt_off000060c5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60C5	18888 bytes
SHA-256: `e09a92444fffebeeb998468a77a403de4618986c60ca4254348b93199fa305b2`

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