PDF malware analysis — malicious · 0f79d276a616b60e

MALICIOUS

PDF

33.1 KB Created: 2021-07-03 18:47:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13

MD5: cc5b05b4c5685530c313fc172d2486fa SHA-1: 351f4704842de8430a0d851e3401561c443498da SHA-256: 0f79d276a616b60e56f790b2bc98ec18501b64824598f22386703cd0a8ee07fb

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains a large number of embedded links, many of which point to resources related to game hacks and free in-game currency. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly flagged this PDF as malicious. The primary IOC is the URL http://netcdn.tw/app/479516143/mcpe-game-hack, which is likely a distribution point for a payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 4

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.
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.tw/app/479516143/mcpe-game-hack PDF link annotation
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-rewards-free-spins_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-robux-for-free_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-coins_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-tiktok-followers-no-survey_GM835599320.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/hack-coin-master-for-iphone_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/fearless-cheat-engine-roblox_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/mcpe-com_GM479516143.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-get-free-unlimited-coins-in-coin-master_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-hack-acc-on-roblox_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/roblox-inappropriate-games_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-roebucks-com_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-robux-without-having-the-vera-cage_GM431946152.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/how-to-hack-coin-master-facebook_GM406889139.pdfIn PDF document text
- http://www.bestbist.com/assets/uploads/pages/files/free-robux-generator-no-survey-no-download-no-human-verification_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_off00003012.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3012	21980 bytes
SHA-256: `578199402f4e105c93289577af155b6441bf3c186a7ce43101a6b9fb570d25f8`
`font_01_sfnt_off00006046.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6046	17808 bytes
SHA-256: `bb08dbf34a52122f895504de6d0f043fb34325a43da687a59d3db3469e279ba9`

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