PDF malware analysis — malicious · 9a85bb1e88ec8cf7

MALICIOUS

PDF

33.7 KB Created: 2021-07-09 09:59:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04

MD5: 13cdac2af5f010cee77e657713d87416 SHA-1: 093f8de3346d8540a29ff4c0e22fee15210c1961 SHA-256: 9a85bb1e88ec8cf758cf18ff65b468aa89ddc98af6b490d4e8fed77a5715101a

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it links to malicious redirector infrastructure, specifically promoting 'game hacks' and 'free generators'. The document body and embedded URLs reinforce this, pointing to a lure for downloading potentially unwanted or malicious software. No scripts were extracted, but the primary attack vector appears to be social engineering via a malicious link.

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/coin-master-spin-hack-no-verification-game-hack In PDF document text
- https://www.similar.com.tw/upload/files/best-free-robux-sites_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/roblox-scp-hack_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/infinite-jump-hack-roblox-download_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-robux-link_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-spin-coin-master-2021-link_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/hack-particle-roblox_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-coin-master-cards_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-robux-games-on-roblox_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/coin-master--hack_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-robux-hack-pastebin-2021_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/coin-master-hacks_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/how-to-get-free-robux-on-mac-2021_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-photosmasher-roblox_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-spin-link-coin-master-today_GM406889139.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/how-to-download-vermillion-roblox-hacks_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/free-robux-just-click_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/roblox-zone-free-robux-generator_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/why-doesnt-my-penguin-hack-on-roblox-jailbreak-work_GM431946152.pdfIn PDF document text
- https://www.similar.com.tw/upload/files/roblox-top-model-cheats_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
`font_00_sfnt_off000030ca.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x30CA	21872 bytes
SHA-256: `ef19032f4cf5a74ad0976b7245224ecf3bbfa6e00613d17caa9cf06eb5d8ae15`
`font_01_sfnt_off000060ec.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x60EC	18312 bytes
SHA-256: `3c52600db59986243a0571f9d94979089bd819b33fd5a3bf9f13833b43aedf21`

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