PDF malware analysis — malicious · ec16d03fe555b528

MALICIOUS

PDF

44.9 KB Created: 2021-05-15 06:47:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 877178fe47fb6bbd59e3e16d035cbb3b SHA-1: 3d1656805c0fcf770bd0709161a1238f07e89ae3 SHA-256: ec16d03fe555b528782f79e19d544588dc33b418a324218a530bf2c1da0a4567

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

This PDF document acts as a link farm, directing users to websites promising game hacks and free currency for popular games like Coin Master and Roblox. The primary lure is the promise of 'free spins and chips' or 'free Robux'. The document contains numerous embedded URLs, many of which are structured as SEO-optimized links pointing to PDF files hosted on beershebaschool.edu.np, suggesting a coordinated effort to drive traffic to potentially malicious or ad-filled sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9632

Heuristics 5

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.
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 https://netcdn.xyz/app/406889139/coin-master-free-spins-and-chips-game-hack PDF link annotation
- https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/coin-master-hack-app_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-minecraft-gift-card_GM479516143.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-roblox-money_GM431946152.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/hack-coin-master-download_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/minecraft-pocket-edition-apk-free-download_GM479516143.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-minecraft-games-for-kids_GM479516143.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/master-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/coin-master-free-spins-hack-apk-download_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/google-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
- https://beershebaschool.edu.np/ckfinder/userfiles/files/free-robux-gift-card-generator_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
`stream_003_off00004a0b.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A0B	25228 bytes
SHA-256: `bb83849e2aefe65960b901eaeeeed4803d273a1be841eb8832f7952a99bc331f`
`font_01_sfnt_off00008365.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8365	2896 bytes
SHA-256: `c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd`
`font_02_sfnt_off00008d4a.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D4A	18224 bytes
SHA-256: `40df3a528aafa73505b8835a2bb808a281604419b6ece47625fe10d66aca2743`

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