PDF malware analysis — malicious · 15f2a580f6b5355f

MALICIOUS

PDF

46.5 KB Created: 2021-06-03 04:10:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 8c9a40b548b56adacc17a04072feef91 SHA-1: d2da407628ca838c309ba57a4f6a6f5fd6d3276e SHA-256: 15f2a580f6b5355fc96fea49dd23991ae90b434329885ca51cc830a4ad66001a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on a 'free Robux generator' which redirects to known malicious infrastructure. The document body, though partially corrupted, contains references to these lures and embedded URLs. The presence of these malicious links and the ML classifier's high confidence score indicate a phishing or scam attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9748

Heuristics 4

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.
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-generator-without-verification-game-hack In PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/to-get-free-robux_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/coin-master-gold-cards-free-2021_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/coin-master-map_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/roblox-robux-hack_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-no-verification_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-exe_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/minecraft-beta-free_GM479516143.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-robux-card-codes_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/wurst-client_GM479516143.pdfIn PDF document text
- https://linhkien247.vn/public/upload/files/get-minecraft-windows-10-free_GM479516143.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_004_off00004d39.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4D39	25336 bytes
SHA-256: `73162e584126689cc82ebc879a863e5dbbd08b7b3592dfd133e6fadef6263790`
`font_01_sfnt_off00008732.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8732	2828 bytes
SHA-256: `db1860fd79a3f2cbe32e2bada3ba4c68a2d581b7a24294387cd777233cc9cef6`
`font_02_sfnt_off000090e9.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x90E9	18964 bytes
SHA-256: `28b129fa50d9ed943d388e6dee4b9579dbddb2c3d46c54f90e146500d20faa97`

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