PDF malware analysis — malicious · 9f11e0d18f677fa1

MALICIOUS

PDF

34.8 KB Created: 2021-07-04 02:28:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11

MD5: 4d3ae2597c42d5b3ff746fc1038ce284 SHA-1: 2ea66dfb82e045aa769790aedec53dc075c994a6 SHA-256: 9f11e0d18f677fa1a3281e96e82652f2711721cfc40af0ad07c4b619d2bc2ed2

160 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as free game hacks for popular titles like Roblox and Coin Master. The document body explicitly contains the malicious URL, reinforcing the lure. The ML classifier also strongly indicated maliciousness. No scripts were extracted, but the embedded URLs are sufficient to indicate a phishing or malware distribution attempt.

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/robloxheroxyz-free-robux-game-hack In PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-free-spins-5-10-2021_GM406889139.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-black-panther-shirt-free_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/cheats-for-titan-simulator-roblox_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-roblox-gun-gsmes_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-apk-mod-free-download_GM406889139.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-mod-hack-tool_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-hack-free-download_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/fre-vip-server-roblox_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-robux-generator_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-things-on-roblox_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/roblox-btools-hack-mega_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/how-can-we-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/free-spin-today-coin-master_GM406889139.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/minecraft-servers-that-allow-hacks_GM479516143.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/how-to-make-a-group-on-roblox-for-free_GM431946152.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/wurst-client_GM479516143.pdfIn PDF document text
- https://www.extrifit.com/uploads/ckfinder/userfiles/files/coin-master-vip-hack_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_off00003052.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x3052	22412 bytes
SHA-256: `a9856bfd3f5e655165116a18c1f450c46d1cfef259e67659dc755f7a58c65747`
`font_01_sfnt_off00006290.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x6290	19220 bytes
SHA-256: `9a75403dc61fcebb8363624a6f582dcc4ac1fd2d4c1d167fae2ecfa95e24b96b`

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