PDF malware analysis — malicious · bae1ec2fde91992e

MALICIOUS

PDF

57.1 KB Created: 2021-06-10 18:24:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21

MD5: 541e84a25ff4b9e8795145521dbb3a91 SHA-1: 70e22adca3ad4a1b338d394ac7d6ef4eb2f57c00 SHA-256: bae1ec2fde91992e10394680bd37898e300fcddc54272846b4cde5b2f7f4aae1

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically advertising 'free exploits' and 'game hacks'. The primary lure URL is https://netcdn.tw/app/431946152/free-exploit-roblox-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering attack aimed at tricking users into visiting potentially harmful websites.

Machine Learning

Nyx PDF Classifier malicious score 0.9560

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/free-exploit-roblox-2021-game-hack In PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/no-scam-free-robux_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-daily-free-spins-link-app-download_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/robux-link_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-money-hack_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-apk-android-1_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/tiktok-free-real-followers_GM835599320.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-xyz_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-generator-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/free-robux-hack-2021_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/claim-free-robux-generator_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-ios-gods-hack_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/play-full-version-of-minecraft-for-free-no-download_GM479516143.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/how-you-get-free-robux_GM431946152.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
- http://www.mucinvitinh.vn/public/images/image_uploads/files/game-hack-coin-master_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00005390.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5390	36408 bytes
SHA-256: `7d85bdc8563c2242ceb323b87b263e9e3d6412b0046e11648265c27f146191f6`
`font_01_sfnt_off0000a518.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xA518	2824 bytes
SHA-256: `94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4`
`font_02_sfnt_off0000aec1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xAEC1	5596 bytes
SHA-256: `9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5`
`font_03_sfnt_off0000bb69.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xBB69	18748 bytes
SHA-256: `43c561440d34ed7895c826d6f7963b65eabccba802df94106b32a0bfe2682183`

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