PDF malware analysis — malicious · fdf7bd2a3653d49e

MALICIOUS

PDF

43.2 KB Created: 2021-06-03 09:08:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: ee9bc44dc03b4bc3ef84b7e59896d44e SHA-1: 502efa349b1f28cde8f71592c32eee93daa41127 SHA-256: fdf7bd2a3653d49e8ad74cffb1e39d6a6c813e8ae83f08d6a4ea6a147de9ddb7

200 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a malicious redirector link disguised as a "free generator / game hack" for Roblox, and presents a fake CAPTCHA to trick users into interacting with the link. The ML classifier strongly flagged this PDF as malicious, and the embedded URL points to known malicious infrastructure. The document likely serves as a lure to download further malware or engage in fraudulent activity.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 5

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
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/earn-free-robux-for-roblox-game-hack In PDF document text
- https://foc.vn/public/upload/files/free-robux-only-username_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/coin-master-free-cards_GM406889139.pdfIn PDF document text
- https://foc.vn/public/upload/files/how-to-get-free-mods-in-minecraft_GM479516143.pdfIn PDF document text
- https://foc.vn/public/upload/files/minecraft-pe-apk-free-download_GM479516143.pdfIn PDF document text
- https://foc.vn/public/upload/files/claim-free-robux_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
- https://foc.vn/public/upload/files/coin-master-cards-hack-2021_GM406889139.pdfIn PDF document text
- https://foc.vn/public/upload/files/roblox-free-draw_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
- https://foc.vn/public/upload/files/www-free-robux_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/free-robux-place_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/picture-roblox_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/free-coin-master-spins-for-today_GM406889139.pdfIn PDF document text
- https://foc.vn/public/upload/files/free-robux-com-roblox_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/coin-master-free-spins-for-today_GM406889139.pdfIn PDF document text
- https://foc.vn/public/upload/files/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
- https://foc.vn/public/upload/files/how-to-get-a-free-pokemon-go-account_GM1094591345.pdfIn PDF document text
- https://foc.vn/public/upload/files/ios-coin-master-hack_GM406889139.pdfIn PDF document text
- https://foc.vn/public/upload/files/minecraft-free-download-android-apk-014-0_GM479516143.pdfIn PDF document text
- https://foc.vn/public/upload/files/haktuts-coin-master-free-spins_GM406889139.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
`stream_004_off00004d4b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4D4B	25008 bytes
SHA-256: `f009bd7e2685a062b045bc70feebb2e54524e79743780d726f5df4992a5e2a2a`
`font_01_sfnt_off00008620.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8620	18316 bytes
SHA-256: `81577c12f28394e63c3fe269139937f952c5f2f271c4ac7315843a65914bc4b9`

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