PDF malware analysis — malicious · 5d1264372a6d33f4

MALICIOUS

PDF

34.4 KB Created: 2021-06-19 10:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11

MD5: de88969738aeb0550aab8a001f0d9555 SHA-1: c4ff45d324d93e4778376a5887fdff3ff8eb7345 SHA-256: 5d1264372a6d33f4fde142039541c67595612b1ae366749bb01a7415272cf6b2

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/can-i-get-free-robux-game-hack. This URL is presented as a 'free generator / game hack', indicating a lure for users seeking in-game advantages. The document body and heuristics confirm the intent to redirect users to potentially malicious content, likely for phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.
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
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/can-i-get-free-robux-game-hack In PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-coins-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-2021_GM431946152.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-online-games-no-download-like-roblox_GM431946152.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/level-coin_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/roblox-noob-t-shirt-free_GM431946152.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-gift-link_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-coins-and-spins-link_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-java-edition-for-free_GM479516143.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-no-survey_GM431946152.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.lakenheath.suffolk.sch.uk/admin/ckfinder/userfiles/files/how-to-get-real-robux_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_off000031a7.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31A7	21896 bytes
SHA-256: `ed8782c68c33480f87ffcd5961b8c7702a0d28c68b97661f91af058eb9604982`
`font_01_sfnt_off0000620e.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x620E	18820 bytes
SHA-256: `1482418a342ed3f1ed9b37dd8c37f12d98a52023a9223b967d12e27c0c804d73`

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