Malicious PDF — malware analysis report

Static analysis result for SHA-256 7894120cc877cf05…

MALICIOUS

PDF

45.7 KB Created: 2021-05-12 22:31:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 481dcc8824fe28c95e6057fa579ff0fb SHA-1: d69806a5c3eb9b90ea4c61860df7f484e396dbdc SHA-256: 7894120cc877cf052d81ee150749c197967b9ee706498c6e8568d99ed1cb2a8a
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 0.9507

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/earn-robux-sites-game-hack PDF link annotation
    • http://jdlwealth.com/images/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-hack-coin-master-in-pc_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/free-cracked-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • http://jdlwealth.com/images/free-roblox-toy-codes_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/pop-slots-free-vegas-casino-slots-machine-game-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-free-skins-in-minecraft_GM479516143.pdfIn PDF document text
    • http://jdlwealth.com/images/robux-game-com_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-roebucks_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/how-do-i-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/coin-master-free-spins--spins_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • http://jdlwealth.com/images/wurst_GM479516143.pdfIn PDF document text
    • http://jdlwealth.com/images/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://jdlwealth.com/images/wwwcoin-master-hack-game-download_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.

FilenameKindSourceSize
font_00_sfnt_off00004c6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C6E 24848 bytes
SHA-256: e7beab8be635390f85f6f89f0957ff1bd74f3579d97208174780ff509627091a
font_01_sfnt_off000085fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85FD 2844 bytes
SHA-256: baad2f3f6808f4af03fa9398e38c580c8d846f7f773a947d8cc1f39b2753d31a
font_02_sfnt_off00008fbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8FBF 18300 bytes
SHA-256: 9e3af24e52ef4cb9fc4b51a762cd65285bc4813e2d9c15cd1a5337b0fae4df73

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