PDF malware analysis — malicious · f83a66bf8415e011

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 22:42:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22

MD5: 08e02b14fa99a17a64635dedb3e902a2 SHA-1: 876017d7bbe5a583e7f721c557959d1404225a5c SHA-256: f83a66bf8415e011bb14f9e24997322df032d2ab1e24621e83b2b88d29825f43

180 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to a known malicious redirector infrastructure, specifically advertising a "free generator / game hack". The ML classifier strongly indicates maliciousness. The embedded URL is the primary indicator of a phishing or scam attempt, likely leading to further malware download or credential harvesting.

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-roebucks-no-human-verification-game-hack In PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-no-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-cards-hack_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/archery-master-3d-hack-unlimited-coins-cheats_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-download-ios_GM479516143.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-robux-for-kids_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-java-for-free_GM479516143.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-stuff-for-free-in-roblox_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/is-tiktok-free-to-use_GM835599320.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-generator-codes_GM431946152.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-without-verification-2021_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-no-verification_GM406889139.pdfIn PDF document text
- https://www.springhead.staffs.sch.uk/admin/ckfinder/userfiles/files/spin-links-for-coin-master_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_off000031ad.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31AD	22276 bytes
SHA-256: `51d555da81f5784ca4ff9157e079a3f81d999effc969630a5ca9b9ccd1b1714a`
`font_01_sfnt_off000062d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x62D8	19296 bytes
SHA-256: `cc9c5a95e89479f65faae98250eeca370e5ba8f51e12989c5a527e80fde28b16`

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