PDF malware analysis — malicious · 33131fb3c872f9b9

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 11:14:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31

MD5: 88ea9ed311a8d29ff23e61e1dd8cc23d SHA-1: 4f0c68a6f00658ef895e8d92c8b58cfcd3276adb SHA-256: 33131fb3c872f9b987ca63b22d00755882612cdf2f4c2f7da96e61f7043900ab

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, specifically http://netcdn.tw/app/431946152/free-robux-codes-generator-game-hack. The document body and heuristics indicate a lure for free game currency or hacks, which is a common social engineering tactic. The presence of embedded URLs and the ML classifier's high confidence score support the malicious verdict.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/431946152/free-robux-codes-generator-game-hack In PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/berby-novedades-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-hack-and-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-spins-for-coin-master-app_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-apocalypse-rising-2-teleport-hack_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/oprewards-free-robux_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-mster-free_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-roblox-executor-no-key_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-hack-download-pc_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/minecraft-free-download-windows-10_GM479516143.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-spin-link-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-cracked-apk-free-download_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/chat-uncensor-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/cheats-for-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-free-coins-twitter_GM406889139.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-no-download-free-online_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-multiplayer-minecraft-server_GM479516143.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-free-rubox_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-catalog-slendytubby-clothes-free_GM431946152.pdfIn PDF document text
- https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master-2021_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_off000032ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x32AB	22564 bytes
SHA-256: `4576d319ddfe04dde5c7f27d2a898571b1b14593ad65f876180c0a33d65c2796`
`font_01_sfnt_off000064c1.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64C1	18996 bytes
SHA-256: `5eb0e14e84a96ce31996bcd37de003c05f35194690cf7e19bda56cbb05988c9f`

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