PDF malware analysis — malicious · 82b48bbde9268362

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 17:08:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07

MD5: a31253b0b961d1f8067c1814cf5a21f4 SHA-1: e40b711eb8aa730183c148f20688776929ea5a73 SHA-256: 82b48bbde9268362c71d692392663f7514e6c1b68f7df749fa122b92387024d9

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links designed to lure users to free game-related items, redirecting to malicious infrastructure. The document body and heuristics indicate a phishing or scam attempt, likely to deliver a secondary payload or lead to further malicious sites. The presence of multiple redirector links and a link farm suggests a coordinated effort to distribute malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.9796

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.
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
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.online/app/431946152/free-robux-script-game-hack In PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/free-coin-master-coins-and-spins_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/how-to-hack-roblox-accounts-on-phone_GM431946152.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/minecraft-jar-free_GM479516143.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/coin-master-free_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/free-spin-link-in-coin-master_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/how-to-use-hacks-in-roblox-prison-life_GM431946152.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/minecraft-book-collection_GM479516143.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/coin-master-free-spins-that-really_GM406889139.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/minecraft-bedrock-edition-pc-free_GM479516143.pdfIn PDF document text
- http://rkh.go.th/ckfinder/userfiles/files/free-robux-gift-card_GM431946152.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000544b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x544B	25884 bytes
SHA-256: `d2406c6ad70e1da9e16a040ccdd6224560afcfbaa45e13f553dc842f1838bc88`
`font_01_sfnt_off00009042.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9042	2844 bytes
SHA-256: `baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a`
`font_02_sfnt_off00009a03.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x9A03	18416 bytes
SHA-256: `7904477eb6282cb79bb1f8d95588be1a5283b3abf5667e30a4d761915d4b26ef`

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