PDF malware analysis — malicious · 3e83b9a1ccc73135

MALICIOUS

PDF

34.3 KB Created: 2021-06-21 09:58:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26

MD5: baabe2a96bed2c53dd6e558b6dc14ac6 SHA-1: 3516348807a0378ee43435509d5486b368ced0a0 SHA-256: 3e83b9a1ccc731356a526365d9f40935fa17a6b518203a6d997958207e73ebf2

220 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it is a malicious redirector lure, specifically targeting users interested in game hacks and generators. The primary URL, http://netcdn.co/app/431946152/roblox-games-com-free-game-hack, is flagged as malicious infrastructure. The document body and embedded links reinforce this lure, aiming to drive traffic to the malicious site.

Machine Learning

Nyx PDF Classifier malicious score 0.9980

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.
Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
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.co/app/431946152/roblox-games-com-free-game-hack In PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-link-quora_GM406889139.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-download-gui-roblox-twisted-murder_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-tricks-and-hacks_GM406889139.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-bedrock-edition-for-free_GM479516143.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-and-coins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-version-2021-download_GM406889139.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-gang_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-hack-me-robux_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/tiktok-free-fans_GM835599320.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/cheats-and-codes-for-jailbreak-on-roblox_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-that-actually-works_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/codes-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/ninja-legend-hack-roblox_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/uprobuxcom-free-robux_GM431946152.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
- https://www.marshlands.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-iphone-free_GM479516143.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_off000031f8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x31F8	21648 bytes
SHA-256: `9c0580aca13f2a158a67e47677a0b913b0204273ee8c1838544ff9b7d6c793b3`
`font_01_sfnt_off0000618f.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x618F	18908 bytes
SHA-256: `63fcf197efd0ab2731d200d540b33a8cc2102b08d529c7d5467440d1b6216513`

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