PDF malware analysis — malicious · 6238052b4e7cd802

MALICIOUS

PDF

34.7 KB Created: 2021-06-29 22:24:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25

MD5: 2705a3b03520315efcf9a32815d8e810 SHA-1: 6e121372096915de7209580fe16d0fa80f05ee5d SHA-256: 6238052b4e7cd802ea4cada67ff914185d2a34741d2f191cfd2fb5f4e0cddde7

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/comment-hacks-roblox-skywars-game-hack PDF link annotation
- https://dolphintour.vn/images/uploadsfiles/free-minecraft-accounts-2021_GM479516143.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/robux-hack-free-robux_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/roblox-elemental-battlegrounds-hack_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/hack-crack-for-coin-master-currency_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/blox-supply-free-robux_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/kachifpro_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/free-999billion-robux_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/coin-master-game-android-free-download_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
- https://dolphintour.vn/images/uploadsfiles/blonde-action-ponytail-roblox-free_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_off00003090.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3090	22112 bytes
SHA-256: `01a539059d8b4597f8a742079b570da308d36e3a06a8c343b33a89bd910ce2c6`
`font_01_sfnt_off00006198.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6198	19364 bytes
SHA-256: `14289148a1477bea268183b67aaf39a8a6a01613eb94846a7c55ee6b32aefd97`

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