PDF malware analysis — malicious · 83f58905468bf9f7

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 21:23:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: da0e65cefadc5911d7c7c15e4656dcd5 SHA-1: 5b77d9ecc52915b94a13a765fcbf88f0b47eb88b SHA-256: 83f58905468bf9f7a169cf21b3f2256c23685a17b8237f0f04f6e29e7e6b36f6

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains links that redirect to known malicious infrastructure, specifically promoting 'free generator / game hack' lures. The document body and embedded URLs reinforce this theme, aiming to trick users into visiting potentially harmful sites. The ML classifier also strongly indicated maliciousness.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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/406889139/free-coins-coin-master-link-game-hack In PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/how-to-get-free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/roblox-avatar-free_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/reddit-coin-master-hack_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-spins-coinmaster_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-robux-with-no-verification-2021_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/how-to-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/how-to-hack-coin-master-apkmody_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/classic-minecraft-net-hacks_GM479516143.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/roblox-admin-hack_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/cool-free-roblox-t-shirts_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/hacking-ldshadowladys-roblox-account_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-robux-games_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-cool-things-in-roblox-that-charecters-played_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/coin-master-app-for-free-spins_GM406889139.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/roblox-bots-to-join-a-group-for-free_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-robux-no-human-verification-generator_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-blank-roblox-shirt-templates_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/how-to-fucking-get-free-robux-2021-real-omg_GM431946152.pdfIn PDF document text
- https://vireco-online.com/ckfinder/userfiles/files/free-robux-generator-kid-friendly_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_off000030bb.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x30BB	22960 bytes
SHA-256: `547bce26907331b8cdbec05fb512cde6a05c9eed109cbf5ea7848f0e1dacfa08`
`font_01_sfnt_off0000646b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x646B	18168 bytes
SHA-256: `b0fd03f2280421e1c8ba538a35ec3a9afcfe64ddb22ef6ef66156561f264a38b`

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