PDF malware analysis — malicious · a317f57b227487d8

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 06:50:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: d2b6032ed52c93f70d47184e761d759f SHA-1: 0fdca97411f626b51b22a0a643fb32d7196c169c SHA-256: a317f57b227487d89af0c531a469151d3a60de02f72f46c2fb009312db8a97fe

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector infrastructure, specifically advertising "free spins" and "game hacks" for popular games. The ML classifier strongly flagged this PDF as malicious, and the embedded URLs suggest a lure for users to download potentially harmful content or be redirected to phishing sites. No scripts were extracted, but the primary attack vector appears to be social engineering via enticing links.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

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 https://netcdn.online/app/406889139/100-free-spins-for-coin-master-game-hack In PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-spin-link-list_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-piano-hack_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-online-free-spin_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-hack-unlimited-spins-apk-download_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification-or-surveys_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/como-hackear-coin-master-sin-verificacion-humana_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-shield-hack_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/roblox-free-robux-com_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-websites-that-actually-work_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/www-bandicam-com-free-robux_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/earn-free-robux_GM431946152.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-spins-2021-ios_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-haktuts_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-email-free-spins_GM406889139.pdfIn PDF document text
- https://www.fluidtecheng.com/uploaded_files/userfiles/files/coin-master-free-soins_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
`stream_004_off00004f08.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4F08	25304 bytes
SHA-256: `2fc862b4da66fe6265d9385aaf9bd2d4c8c2f52b8de1e59b087a8785bdebbf64`
`font_01_sfnt_off00008881.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8881	18164 bytes
SHA-256: `7606299dfa9380825ccbbaa06a4275f303ebe4faec3a3444b55fb030233e8f05`

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