PDF malware analysis — malicious · 2d428b4f97234995

MALICIOUS

PDF

35.6 KB Created: 2021-06-25 07:01:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27

MD5: 1529186e9d33b82f28088d3f468a5be2 SHA-1: 6e965dd37482629ecf9d6fe4efa48ea5b2dedab1 SHA-256: 2d428b4f97234995b47ea807abb5d690448ec2b68e302e000ed2229f7aa29832

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links to external resources, including a primary link to a malicious redirector at http://netcdn.co/app/431946152/on-builders-club-can-you-get-robux-for-free-game-hack. This redirector is associated with a 'free generator / game hack' lure, indicating a likely attempt to distribute malware or conduct phishing. The document body and heuristics confirm the presence of a link farm designed to attract users with promises of free in-game currency or hacks.

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/on-builders-club-can-you-get-robux-for-free-game-hack In PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-get-free-robux-by-watching-a-video_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/tiktok-free-play-online_GM835599320.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-gen-no-survey_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/rewards-robux_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-shirts-for-free_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/how-to-upload-roblox-audio-for-free_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/all-links-for-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/hack-coin-master-app-ios_GM406889139.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/pokemon-go-free-9-nerf_GM1094591345.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/free-minecraft-realms-to-join_GM479516143.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-gifts_GM406889139.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/minecraft-skins-download-free_GM479516143.pdfIn PDF document text
- https://hunting.beta.privatewaterfishing.com/userFiles/files/coin-master-free-spins-and-coins-today_GM406889139.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_off000032cb.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32CB	22644 bytes
SHA-256: `b48d42043ed3cc9901bf14829ddc8c23f2a6e9a21dd1fd05e4521e6354b7062a`
`font_01_sfnt_off00006552.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6552	19348 bytes
SHA-256: `c2f894396782f01663656952b0712c900cfbf2869f2971bbc1c33e2dcdb2d607`

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