Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21b05868a0cee85…

MALICIOUS

PDF

42.9 KB Created: 2021-05-19 09:35:13 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 2d367b08cd5464f6f6e0d432c36c6a9f SHA-1: 9a03b19e2473ea3f65f8d2d5f763f57ba91a5503 SHA-256: f21b05868a0cee85d506a5f0fb72900cfaa3006f74f869431f67d5a8c6ac20a3
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 0.9971

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/promo-codes-to-get-free-robux-game-hack PDF link annotation
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-2021_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/free-robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/moonactive-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/show-me-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/free-robux-real-2021_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/free-robux-no-gift-card_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/coinmaster-spins_GM406889139.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/minecraft-for-free-on-phone_GM479516143.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/minecraft-hack-mod_GM479516143.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/free-robux-site_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/minecraft-pe-texture-packs-free-download_GM479516143.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • http://mtsn1sungaipenuh.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-no-verification-deutsch_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000479f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x479F 26352 bytes
SHA-256: 6b72a69c449f6432c54c2781b21f4f55fbbd4069cffc9869bb8d73b0145d96e3
font_01_sfnt_off0000843d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x843D 18704 bytes
SHA-256: 994ba2c21992eebcab5dcb0bf7b99b22a17e2009da779e2696cdc2096136ed4a

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