PDF malware analysis — malicious · 2c5cd3b5403ef71d

MALICIOUS

PDF

44.8 KB Created: 2021-05-12 20:34:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05

MD5: 838d64bb8cb70f155269042bf709f074 SHA-1: d983d6c6ffdb666a3a554f5586433fd28d791dec SHA-256: 2c5cd3b5403ef71d4be762645109d7fa1eff63e2e9fb0c604deed3ae33822be3

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 0.9632

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/free-spins-coins-coin-master-game-hack PDF link annotation
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/roblox-group-free-robux_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-hack-roblox-on-mobile_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-get-coin-master-free-spins-in-email_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-giveaway-live_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-free-spins-fb-champion_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-spins-coin-master-links-blogger_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coin-master-hack-online-pc_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/coinmaster-blogspot_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-easy_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/master-coin-free-spin-daily_GM406889139.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/mcpe-free-download_GM479516143.pdfIn PDF document text
- http://www.lorengntb.com/new/public/ckfinder/userfiles/files/free-robux-no-verification_GM431946152.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_off00004a1e.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4A1E	24912 bytes
SHA-256: `72c763e7e18a715cc8770ca0f060d0a4316474badfff00b5a6e091de702474bf`
`font_01_sfnt_off000083b2.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x83B2	2880 bytes
SHA-256: `10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132`
`font_02_sfnt_off00008d9c.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D9C	17884 bytes
SHA-256: `18816d8d761583b578c9833b8849e2eeaed27ef2f16a893d2032c58e3f8148b6`

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