PDF malware analysis — malicious · 1522de4a23fdd81b

MALICIOUS

PDF

35.7 KB Created: 2021-05-25 10:02:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25

MD5: f6ba11c61555341cfaa834b406b22cce SHA-1: bf4d2ba12dee3570c5bded56b1f965b7cb00df42 SHA-256: 1522de4a23fdd81b239b100b2baec20a65ee99e959abfff940a03c2f71524677

240 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document employs social engineering tactics, including a fake CAPTCHA and a "download" button, to trick users into clicking a malicious link. This link redirects to a "free Robux generator" website, which is a common lure for phishing or malware distribution. The document also contains embedded URLs that point to potentially malicious or misleading content, further supporting the malicious intent.

Machine Learning

Nyx PDF Classifier malicious score 0.9492

Heuristics 6

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.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE

Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
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.xyz/app/431946152/free-robux-com-game-hack In PDF document text
- https://www.prodex-holz.cz/images/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
- https://www.prodex-holz.cz/images/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
- https://www.prodex-holz.cz/images/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
- https://www.prodex-holz.cz/images/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
- https://www.prodex-holz.cz/images/password-free-roblox-accounts_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
`stream_002_off000030dd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x30DD	24752 bytes
SHA-256: `90209bb7fcf4ddafbf271dafed9d407c3dd1b7e7d4d09aa75ab636b7e58dd1b7`
`font_01_sfnt_off00006a28.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6A28	18276 bytes
SHA-256: `d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6`

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