PDF malware analysis — malicious · 234e7bdab0b21ef5

MALICIOUS

PDF

34.7 KB Created: 2021-06-21 10:06:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 49ab64f0ffea557997f3530472118051 SHA-1: 060cf0b319cd1df56ec75898744d59b415b9e265 SHA-256: 234e7bdab0b21ef5fa202b4fa56c78e698705d6370ce085a48b211da1d65d5be

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document employs a game hack lure to redirect users to external websites, which in turn host a large number of similar PDF files. This behavior is indicative of a link farm or SEO manipulation tactic designed to drive traffic to potentially malicious content. The ML classifier strongly supports the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.co/app/431946152/roblox-secret-cheat-codes-for-music-steven-universe-game-hack PDF link annotation
- https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-robux-no-pass-requiredfor-pc_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-get-a-refund-on-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-coins-for-flip-master_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-make-something-free-on-roblox_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-hack-a-minecraft-server-and-make-yourself-op_GM479516143.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-get-roebucks_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/how-to-get-free-robux-in-roblox-2021-no-survey_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-coins--spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/pubg-uc-18_GM1330123889.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/roblox-game-play-online-for-free_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/create-roblox-cheat-script_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/hack-xp-net-coin-master_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/minecraft-windows-10-edition-free-download_GM479516143.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/coin-master-heaven-free-spins-and-coins_GM406889139.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/free-roblox-groups_GM431946152.pdfIn PDF document text
- https://www.tiancom.com.tw/upload/files/roblox-free-robux-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_off0000302f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x302F	21976 bytes
SHA-256: `b517dd1e5844346c771c341fc7e6dbad4210872a23dbce88e0477ff1fa67e520`
`font_01_sfnt_off000060b6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60B6	19664 bytes
SHA-256: `25fd2b5736d0122d3d72f8f81786cc1a13354ecc39dbac64916f1da7df62e149`

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