PDF malware analysis — malicious · 95b9153b72f11171

MALICIOUS

PDF

47.5 KB Created: 2021-06-03 09:24:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22

MD5: db5d91fa3f0e9e96bd53285a3a50c130 SHA-1: 24be4b0a0761329ade259e7233681219e0c98bfa SHA-256: 95b9153b72f1117146102bae2b352590a2c336ac8560e3a15d3422ee2fec1be7

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting 'free generator / game hack' lures. The document body, though partially corrupted, contains references to these lures and embedded URLs. The primary malicious link identified is https://netcdn.online/app/406889139/free-spin-and-coin-links-game-hack, which is flagged as a known malicious redirector. No scripts were extracted, but the presence of malicious links and the lure indicate a phishing or scam attempt.

Machine Learning

Nyx PDF Classifier malicious score 0.9769

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/free-spin-and-coin-links-game-hack In PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/free-robux-wheel_GM431946152.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/free-online-spins-coin-master_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/pop-slots-free-vegas-casino-slot-machine-game-coin-master_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/free-minecraft-com_GM479516143.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-spins-link-download-hack_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/levvvel-coin-master_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/impact-minecraft-hack_GM479516143.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/coin-master-free-shield_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/free-robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/hack-spin-coin-master-2021_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/coin-master-game-hack-app-download_GM406889139.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/wurst-18-9_GM479516143.pdfIn PDF document text
- http://www.repion.com/uploaded_files/userfiles/files/coin-master-facebook-page_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off000053fd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x53FD	23940 bytes
SHA-256: `59c972dde3d9ca70b8310bb0c985175ad833c12206b62d459aa268038e784ae8`
`font_01_sfnt_off00008ac5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8AC5	4020 bytes
SHA-256: `dbaa9c12d07f3632734605f1d5d6dee3ad5af1f57488e46d95dab68b383f08c5`
`font_02_sfnt_off0000984d.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x984D	17896 bytes
SHA-256: `9e473fa370b66a6494b15977b9d2a3ea7c01ddc9c3166ab955b90e57f7a3e83c`

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