PDF malware analysis — malicious · 521641ede618099f

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 20:37:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16

MD5: 8082a964942e9bfe8be407b24ef09e29 SHA-1: beed302af2ed114977f11df420ecca5e59890825 SHA-256: 521641ede618099f4540662330238bdf5eeea430dc3bccc32822b5a44b4e2b92

102 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains numerous embedded links to external resources, many of which are SEO-optimized PDF files related to game cheats and hacks. The presence of a 'download button' heuristic and a direct link to a game hack download page suggests a lure to download further malicious content. The ML classifier strongly indicates maliciousness, and the PDF structure itself is flagged for containing a link farm.

Machine Learning

Nyx PDF Classifier malicious score 0.9865

Heuristics 4

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
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.online/app/479516143/minecraft-windows-free-game-hack PDF link annotation
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/feb-23-2021-free-coin-master-spins_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-tiktok-followers-without-human-verification_GM835599320.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/toolbox-for-minecraft-windows-10_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-gold-cards-hack_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-pe_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-just-enter-username-and-password_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-rewards_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/coin-master-fun-hack-online_GM406889139.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/tiktok-free-views_GM835599320.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/roblox-redeem-robux_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-free-ios-no-verification_GM479516143.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.denpasarinstitute.com/new/public/ckfinder/userfiles/files/minecraft-java-free-account_GM479516143.pdfIn PDF document text
- https://www.youtIn 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
`stream_004_off00005583.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5583	24492 bytes
SHA-256: `7bc9914275df1ad972bdae261fd4c0e0204114ce9808106887be79e167eac015`
`font_01_sfnt_off00008cf5.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8CF5	18244 bytes
SHA-256: `17ed61b8d418eb531f0e9f48c5430b9261b703312875c5060f44484e1085bb50`

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