PDF malware analysis — malicious · 5c5626a3a6566174

MALICIOUS

PDF

46.5 KB Created: 2021-05-10 15:03:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04

MD5: 9c50ef3a3a710e71ebce2e00bccc75a4 SHA-1: e287ca3929d8e91d1cb387e66458c55f4a574637 SHA-256: 5c5626a3a6566174ab8d51b2d5c7b0b7828146e6b19a5421f74177f0e3deadc6

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.8948

Heuristics 5

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.
PDF links to a 'free generator / game hack' redirector high 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.
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
External URI info PDF_URI

PDF contains an external URL action
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 https://netcdn.xyz/app/406889139/daily-free-spins-coin-master-2021-game-hack PDF link annotation
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-spins-hack_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-coin-master-hacks_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hacks-for-gold-cards_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-hack-roblox-to-get-robux_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-march-2021_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-free-hair-in-roblox_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-hacked-client-18_GM479516143.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-make-robux-on-roblox_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/free-spins-coin-master-2021-glitch_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/multiplayer-master-hack-coins_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-system_GM431946152.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
- https://www.allsaints-denstone.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_003_off00004cdd.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4CDD	24928 bytes
SHA-256: `22984a62fce8bea7cdfde3e33665fd1c896ceca8ffa9aa253d8fe30f55ee0596`
`font_01_sfnt_off000086ae.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x86AE	3400 bytes
SHA-256: `4b3e0f36ad1e0c7e3ea5c178fd2b4f097d1e01575fc6a4101a8b520db34dfe07`
`font_02_sfnt_off000091d8.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x91D8	18708 bytes
SHA-256: `76af36f54327e394f6a0995f5c1804c6d580e71cb7eebf938ec25838add40309`

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