PDF malware analysis — malicious · 751fbf40cedb2e49

MALICIOUS

PDF

35.6 KB Created: 2021-06-19 03:16:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: ebca319da42383b8f344bb595158e102 SHA-1: e2b1f5401ffafffd0e8ed809cdf46ddfa6162a87 SHA-256: 751fbf40cedb2e4961f4eacb8be720ba6de7b64b51873e32b4b300a0859ce78d

162 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 6

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.
Callback phishing phone lure medium SE_CALLBACK_LURE

Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
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 http://netcdn.co/app/431946152/orewards-com-free-robux-game-hack PDF link annotation
- https://www.captaingogo.com/uploaded_files/userfiles/files/who-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-free-spins-links-app_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/working-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/free-robux-generator-for-kids_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/free-coin-master-androd-cheats-2021_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-hack-apk-july-2021_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/hack-coin-master-free_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/roblox-top_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/minecraft-mod-menu-apk_GM479516143.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/bloxpink-free-robux_GM431946152.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
- https://www.captaingogo.com/uploaded_files/userfiles/files/make-your-own-minecraft-server-free_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_off0000311a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x311A	23296 bytes
SHA-256: `2db219631103842ea14ccc2c0cf8ce59a6f91756f73a8344aab044a0aed0edd5`
`font_01_sfnt_off00006552.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6552	19312 bytes
SHA-256: `2fc58e6e34b5e1a71d14c980e21155da553bce1e3a50e036c939353e45099324`

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