PDF malware analysis — malicious · 3214875ad36e58c2

MALICIOUS

PDF

42.1 KB Created: 2021-05-11 05:34:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: c9b11951303ef325114048cc6859159e SHA-1: 199ed7c6488ab24b5e9d8b95ab03a957b1ca277a SHA-256: 3214875ad36e58c20cc24a8152d693c7d32a99d1e2e1e214b0a7de807d8db22d

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

Heuristics 6

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.
PDF links to a 'free generator / game hack' redirector high 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.
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
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
External URI info PDF_URI

PDF contains an external URL action
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/406889139/coin-master-hacks-no-surveys-game-hack PDF link annotation
- https://www.sarsen.net/uploads/files/files/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-codes-generator-no-verification_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/roblox-redeem-codes-free_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/hack-coin-master-mod-apk_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/25-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-minecraft-server-hosting-24-7_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/minecraft-coins-free_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/how-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-roblox-cards-pin-number_GM431946152.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/free-online-games-like-minecraft_GM479516143.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/coin-master-50-spin-link_GM406889139.pdfIn PDF document text
- https://www.sarsen.net/uploads/files/files/roblox-earn-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
`stream_003_off00004a8c.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A8C	24488 bytes
SHA-256: `45eed133e506de90e694769bdd2b9bb346777f6b996640fd2643b175c642ad68`
`font_01_sfnt_off00008280.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8280	18148 bytes
SHA-256: `55a2c5e1b7f94918972dbf36de35b773a73c2c126b1f6e018f905b5ffe646750`

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