PDF malware analysis — malicious · 9ef0daee5c14324e

MALICIOUS

PDF

46.3 KB Created: 2021-05-16 12:06:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: d5fc0cb2ea5b9d98ec221a889efd3b9d SHA-1: 79d7e7f630c737bb69ff9fe02c679d1cad83a730 SHA-256: 9ef0daee5c14324eb04ff747bd3b71eed91d72723d88ccf8a21525c9d8bb96a5

142 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment

The PDF contains numerous links designed as a link farm, with a primary URL pointing to a game hack lure. The ML classifier also flagged the PDF as malicious. The document body, though partially corrupted, contains references to game hacks and URLs that reinforce the lure. No scripts were extracted, but the PDF structure itself facilitates the redirection to potentially malicious content.

Machine Learning

Nyx PDF Classifier malicious score 0.8696

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/coin-master-card-collection-link-game-hack PDF link annotation
- https://www.yatrikathmandusuite.com/userfiles/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spins-link-june-2021_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/roblox-place-rewards_GM431946152.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/free-spins-for-coin-master-hack_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/how-to-get-free-robux-without-verification_GM431946152.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/20-free-spins-coin-master_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/free-robux-promo-codes-2021_GM431946152.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/spin-coin-master_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/how-to-find-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/coin-master-daily-spins-and-coins_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/how-to-change-roblox-username-for-free-2021_GM431946152.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/minecraft-116-apk-download_GM479516143.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/free-coin-master-cards-link_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/free-spin-links-coin-master-october-30-2021_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
- https://www.yatrikathmandusuite.com/userfiles/files/is-minecraft-free-on-pc_GM479516143.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_off00004c0e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4C0E	26884 bytes
SHA-256: `56cc178580578915a813593e451533dde3aa92546835d4de850d8c5f1e90f2a7`
`font_01_sfnt_off000089ab.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x89AB	2840 bytes
SHA-256: `3fb127b764b9d10f5525bc4de5ec8316de704409ccb0cf21cff3ad8a30d11676`
`font_02_sfnt_off0000935c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x935C	17964 bytes
SHA-256: `ad59076b8e4795e22649a54fdb73642df658d3c1f4ddc63a39bd02642d6714ff`

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