PDF malware analysis — malicious · acf7b445c7e82555

MALICIOUS

PDF

44.2 KB Created: 2021-06-10 15:10:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24

MD5: 51b851444adb4fabc3292f6c21ab3611 SHA-1: 5d1c43f579a93eaec6566c2e36f63e275fc89197 SHA-256: acf7b445c7e825554e76685675abee4ffdfc8f8fe9ca47abfa51d10d0d547b2c

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, disguised as "game hacks" or "free generators" to lure users. The embedded URL https://netcdn.tw/app/431946152/robux-promode-hack-2021-game-hack is a primary indicator of this malicious redirection workflow. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or scam attempt.

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.tw/app/431946152/robux-promode-hack-2021-game-hack In PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-free-login_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-cards-link-2021_GM406889139.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/bloxawards-com-earn-free-robux_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-com-free-robux_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-pe-apk-download-free-015-0_GM479516143.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-cracked-client_GM479516143.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-noclip-cheat-engine-2021_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/roblox-speed-hack_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/free-coin-master-spins-link-download_GM406889139.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/2021-free-robux-202120210-working-legggggit_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/hack-avatar_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/free-roblox-clothes_GM431946152.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/minecraft-windows-10-edition-hacks_GM479516143.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
- http://www.rigor.co.mz/uploaded_files/userfiles/files/coin-master-free-spins-coins_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
`font_00_sfnt_off00004f42.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x4F42	24488 bytes
SHA-256: `6f9030750919d4a9e169abf870563c8ed245375d090f7e4e66e5ee65767e8985`
`font_01_sfnt_off00008707.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8707	19240 bytes
SHA-256: `082a6c1343b92209b4af4d3eb21c2b33c1277e8fd00a24a8f55a7064be875546`

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