PDF malware analysis — malicious · d6b32bce74a6db5c

MALICIOUS

PDF

35.3 KB Created: 2021-07-03 14:04:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27

MD5: eea43aa58b41b770788b7546cc5fe9c1 SHA-1: 8bd67f723c878797d1cb46e95cf9c03d2fd73d90 SHA-256: d6b32bce74a6db5c0bb1d9d442e2ccd5bc49a2bd4df34019c5bc0c3b8e877d1d

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a lure for 'Free Robux' and links to a known malicious redirector infrastructure. The document body and embedded URLs suggest a scam designed to trick users into visiting malicious sites, likely for credential harvesting or further malware delivery. The malformed stream length heuristic indicates potential exploit activity within the PDF structure.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

Heuristics 5

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.
Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH

A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
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/431946152/free-robux-2021-no-human-verification-game-hack In PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/roblox-hacks-board_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/course-obstacle-2021-roblox-cheat-code_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/how-do-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/how-to-coin-master-hack_GM406889139.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/get-free-robux-today_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/roblox-summoner-tycoon-cheats_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/robux_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/free-uganda-knuckles-morph-roblox_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/dragon-ball-online-roblox-hack_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/coin-master-hacked-apk-download-for-android_GM406889139.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/free-robux-hack-generator-no-survey_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/free-robux-no-human-verify_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/how-to-get-free-roebucks-on-roblox_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/coin-master-hack-ios-apk_GM406889139.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/free-roblox-gear_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
- http://camphat.com.vn/upload/UploadFiles/files/free-robux-no-hack-no-scam_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_off000031d6.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31D6	22080 bytes
SHA-256: `ca130117ce3b63cc648e00d93c28c17f35db3845ddae987ef24a2abcc3035601`
`font_01_sfnt_off000062c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62C1	19736 bytes
SHA-256: `415a8643b263bdb8a5e4ae51f1e0119ae52f9187a77a7c28158d674e6dc65c25`

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