PDF malware analysis — malicious · 68f648d04d0f22be

MALICIOUS

PDF

35.0 KB Created: 2021-07-19 21:50:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 18ff81343b024c9fd6e014ea5118e5c2 SHA-1: 6a4f61caf20625ca04d4264ca432792702a6d62c SHA-256: 68f648d04d0f22be52d91aa183164ede8dc08c1e11d8740ef1b4fa80ad12f055

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to known malicious redirectors and lures users with promises of free game items. The primary lure is 'Free Spin In Coin Master' and directs users to 'http://netcdn.tw/app/406889139/free-spin-in-coin-master-game-hack', which is flagged as a malicious redirector. The document body also contains numerous links to other PDF files hosted on 'helsoft.se' which are likely part of the same lure campaign.

Machine Learning

Nyx PDF Classifier malicious score 0.9971

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-spin-in-coin-master-game-hack In PDF document text
- https://helsoft.se/images/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
- https://helsoft.se/images/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
- https://helsoft.se/images/roblox36com-free-robux_GM431946152.pdfIn PDF document text
- https://helsoft.se/images/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://helsoft.se/images/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
- https://helsoft.se/images/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
- https://helsoft.se/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://helsoft.se/images/minecraft-free-download-pc_GM479516143.pdfIn PDF document text
- https://helsoft.se/images/minecraft-bedrock-edition-free_GM479516143.pdfIn PDF document text
- https://helsoft.se/images/bux-life-free-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_002_off00003350.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x3350	23436 bytes
SHA-256: `77edef2df5361e8ad280443e3e47303ccad28e0069c2e0858171a159d84f78bd`
`font_01_sfnt_off00006855.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6855	17884 bytes
SHA-256: `d73da77b5a1bbc7a2b5b207bcae6a8efd78ccb1f3c8a04009520d94079973ddb`

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