PDF malware analysis — malicious · 42634567b7cd5250

MALICIOUS

PDF

35.8 KB Created: 2021-07-06 06:00:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23

MD5: b99198e061c377ccbe79901f17d9ead3 SHA-1: 145db19c6461f22d5449054242e2ed6765b1d513 SHA-256: 42634567b7cd52505009f02cf4e046756fdebff0194382d2a41e0138cd847632

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically http://netcdn.tw/app/431946152/free-robux-by-watching-ads-game-hack. The document body and embedded URLs suggest a lure for game-related cheats or hacks, which is a common social engineering tactic. The ML classifier strongly indicates maliciousness, and the overall structure points to an attempt to exploit vulnerabilities or trick the user into downloading a secondary payload.

Machine Learning

Nyx PDF Classifier malicious score 0.9984

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-by-watching-ads-game-hack In PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/ghost-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/coin-master-hack-download-ios_GM406889139.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/hack-scripts-for-roblox-download_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/roblox-girl_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/roblox-hack-free-robux-2021_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/coinmaster-rewards_GM406889139.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/roblox-robux-hack-february-2021_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/roblox-free-clothes-pastebin_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/how-to-play-roblox-on-itunes-for-free_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/coin-master-free-spins-only_GM406889139.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/free-roblox-accounts_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/que-hacer-cuando-te-hackean-la-cuenta-de-roblox_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/roblox-hack-scripts-pastebin_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-august-2021_GM431946152.pdfIn PDF document text
- https://www.midrarreservations.com/uploaded_files/userfiles/files/jailbreak-roblox-hack-mac_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_off000033ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x33AB	22232 bytes
SHA-256: `d83937387e9106cd9721928c57aa9c96cf3a2cdeaa5a39f002712bf9e0ffde1e`
`font_01_sfnt_off000064f5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x64F5	19660 bytes
SHA-256: `f0cdf6166c464805662a9cde01402bcc449eb6222422d9d5af766ad530424c87`

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