PDF malware analysis — malicious · 323805afcda1f555

MALICIOUS

PDF

33.8 KB Created: 2021-07-19 17:11:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 1adbd9fbd546fb0332f521fe4e888243 SHA-1: 56b92428c0430e83e49085c4989dbe5d69ac060a SHA-256: 323805afcda1f55569702bb0a4a53c1999f7ce68b0dba0f0c9d53a64193d0cec

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple embedded links that redirect to malicious infrastructure, specifically advertising 'free Robux' or 'game hacks' to lure users. The ML classifier strongly flagged this PDF as malicious, and heuristic rules identified it as a redirector link. The document body and embedded artifacts suggest a social engineering attempt to drive traffic to potentially malicious sites.

Machine Learning

Nyx PDF Classifier malicious score 0.9946

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 http://netcdn.tw/app/431946152/how-to-get-free-robux-without-verification-game-hack In PDF document text
- https://vstarnippers.com/images/free-robux-no-password_GM431946152.pdfIn PDF document text
- https://vstarnippers.com/images/how-to-get-minecraft-for-free-on-iphone_GM479516143.pdfIn PDF document text
- https://vstarnippers.com/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://vstarnippers.com/images/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://vstarnippers.com/images/robloxmatchcom-free-robux_GM431946152.pdfIn PDF document text
- https://vstarnippers.com/images/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
- https://vstarnippers.com/images/free-robux-legit_GM431946152.pdfIn PDF document text
- https://vstarnippers.com/images/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://vstarnippers.com/images/free-minecraft-survival-server_GM479516143.pdfIn PDF document text
- https://vstarnippers.com/images/minecraft-free-install_GM479516143.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_off00002dd5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x2DD5	22252 bytes
SHA-256: `dfded73242d08f8e12f1543d1d62292754f5481251cd95d46d0cc996f00f9328`
`font_01_sfnt_off00005f0f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5F0F	19312 bytes
SHA-256: `eb1c0975d0c71be315e6abe7b5e51258c56129465615f62f4b55ea72fa58727d`

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