Malicious PDF — malware analysis report

Static analysis result for SHA-256 05df7576423fa3ce…

MALICIOUS

PDF

45.5 KB Created: 2021-05-14 11:26:16 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: a60d4fda11694aa1c3d4bdce07e19275 SHA-1: 69bd8b58d01bfe0d532c75887c54c4d69217f249 SHA-256: 05df7576423fa3ce9dfed7ca802500726f2ccdfaccf6f417bd2cd7ed488a3fef
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/406889139/how-to-get-free-spins-on-coin-master-without-verification-game-hack PDF link annotation
    • http://legs11.co.za/images/hack-xp-net-generators-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/daily-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-free-cards-link_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/minecraft-windows-10-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/how-to-use-scripts-in-roblox-hack_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-robux-2021-no-verification_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-hack-ios-cydia_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-2021-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/best-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/113-hacked-client_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-hack-tool-no-survey_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://legs11.co.za/images/coin-master-daily-free-spins-link-today-facebook_GM406889139.pdfIn PDF document text
    • http://legs11.co.za/images/codes-to-get-free-robux_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.

FilenameKindSourceSize
font_00_sfnt_off00004a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A25 25916 bytes
SHA-256: c874a2847f2b8db268cb1fb9cbb87b7d417ae70dbcd9923f258f49112499c4cf
font_01_sfnt_off0000841d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x841D 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00008e02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E02 18688 bytes
SHA-256: 34013a01fc9b19de026014672642da8d02f9cc4163dada898040bd77c253fb22

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