PDF malware analysis — malicious · ad9cefc867db8434

MALICIOUS

PDF

32.5 KB Created: 2021-07-19 06:53:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 3dc770962b840eba87a7c7d8d3e0d41a SHA-1: 0a72c6ca2682695af74e36d3156c6767d4d2a6fd SHA-256: ad9cefc867db84344a7062eec0ced6ca2bb7d3be1538d25520bc44be0aca8748

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, such as http://netcdn.tw/app/431946152/free-roblox-accounts-with-robux-2021-game-hack, which are designed to lure users with promises of free game items. The document body and embedded links suggest a scam related to popular online games like Roblox and Minecraft. The presence of embedded links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9900

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/free-roblox-accounts-with-robux-2021-game-hack In PDF document text
- http://serviio.org/images/minecraft-realms-free-trial_GM479516143.pdfIn PDF document text
- https://serviio.org/images/free-texture-packs-for-minecraft-pe_GM479516143.pdfIn PDF document text
- https://serviio.org/images/free-tiktok-accounts-and-passwords_GM835599320.pdfIn PDF document text
- http://serviio.org/images/robux-hack-me_GM431946152.pdfIn PDF document text
- https://serviio.org/images/free-spins-coin-master-links_GM406889139.pdfIn PDF document text
- https://serviio.org/images/rblx-gg-free-robux_GM431946152.pdfIn PDF document text
- https://serviio.org/images/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
- https://serviio.org/images/minecraft-free-play-no-download_GM479516143.pdfIn PDF document text
- https://serviio.org/images/minecraft-free-computer-game_GM479516143.pdfIn PDF document text
- https://serviio.org/images/free-likes-on-tiktok_GM835599320.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_off000027da.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x27DA	22464 bytes
SHA-256: `aaa2eaebd2813f205f8f3b73166ab3fe6cbae55b7e829ec06c7a52caccd5d55c`
`font_01_sfnt_off00005a1d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x5A1D	19264 bytes
SHA-256: `c0014411b3316b3a561a35e78707775e6583f40bd975b442ad0ffc94000f9b28`

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