PDF malware analysis — malicious · 9529d90b4a21cde5

MALICIOUS

PDF

34.3 KB Created: 2021-06-18 10:10:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: 669aaf3a208eb38955331a3510f9fc17 SHA-1: 04ab73414764bac70138ba8697d3f942a0174e6f SHA-256: 9529d90b4a21cde5d0d6a6179aa82bc11d6f697aaa33e1f5d7ef3b4aa4c04f77

260 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs social engineering by promising game hacks and free currency to entice users to click on embedded links. The links lead to redirectors and a large number of other PDFs hosted on 'kumotor.com.tw', suggesting a link farm designed to distribute malicious content or lead to further compromise. The ML classifier strongly indicates malicious intent, and the presence of numerous links points towards a phishing or malware distribution campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 6

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.
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.
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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/how-to-get-money-in-roblox-high-school-cheat-engine-game-hack In PDF document text
- http://kumotor.com.tw/upload/userfiles/files/minecraft-realms-free-codes_GM479516143.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/gaming-dunia-coin-master-free-spins_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/hack-coin-master-game_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/roblox-arcane-adventures-stats-hack-script_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/robux-gift-card-free_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/coin-master-hack-apk-april-12-2021_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-minecraft-windows-10_GM479516143.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/copy-and-past-to-hack-roblox_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/free-roebucks-com_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/how-to-get-free-snacks-on-coin-master_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/free-robux-rewards_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/free-tiktok-likes-no-human-verification-or-downloading-apps_GM835599320.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/was-roblox-hacked_GM431946152.pdfIn PDF document text
- http://kumotor.com.tw/upload/userfiles/files/minecraft-free-online_GM479516143.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_off00002f22.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2F22	22228 bytes
SHA-256: `e619fe55304dfc0e325c6ac68fd21235f50935b2ed0d9cfd8672b7ce472ee860`
`font_01_sfnt_off0000607a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x607A	19232 bytes
SHA-256: `092fe7f1bc6d9d3e084c5de6bc201710fdb29a68d1c26bec85d6f6ad37f6be3a`

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