PDF malware analysis — malicious · b9580c0630ec8b39

MALICIOUS

PDF

46.9 KB Created: 2021-05-16 05:56:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29

MD5: 1a335617c280eec5ddfc21ada1f0739c SHA-1: e3e3b31489faa8184b90c1421f1958bf9caf767e SHA-256: b9580c0630ec8b39ae18f5c9149e0fbf48dd3f13a170ff0731cec5793af40405

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/431946152/roblox-apocalypse-rising-hack-game-hack PDF link annotation
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-free-spin-and-coin-link-app_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/easy-way-to-get-robux_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-coins-and-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-free-spins-link-2021-twitter_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-get-minecraft-pe-for-free-ios_GM479516143.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/lots-of-robux_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-332-apk-free-download_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-2021_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/master-coin-hack_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/roblox-hack-generator_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/how-to-get-free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/hacking-apps-for-roblox_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/como-generar-coin-master-free-spins_GM406889139.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/robux-hack-2021_GM431946152.pdfIn PDF document text
- https://www.vizyonproduction.com/application/uploads/assets/files/20-free-spin-link-coin-master_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_off00004aa1.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x4AA1	25720 bytes
SHA-256: `518145bbae53fc6e1be2196e16d4c06f00497f7034bfd8f4c1bf5046d8047021`
`font_01_sfnt_off00008598.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8598	5696 bytes
SHA-256: `450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139`
`font_02_sfnt_off000092aa.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x92AA	18948 bytes
SHA-256: `c81671b47ab5e7fd402c3d16699df98b51b9b699798839031d1ff55305a8bd80`

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