Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6bf00eaedd4e574…

MALICIOUS

PDF

47.0 KB Created: 2021-05-20 02:12:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3f06f3c4ee901dd6408ecc93fd3279da SHA-1: b95ea3bfc7b05d876bba5352e073c373b47ce160 SHA-256: c6bf00eaedd4e574300b89b3fbcc8a65f2d95b60520125230808b9fd81c18790
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/free-robux-com-game-hack PDF link annotation
    • http://aviaprofsoyuz.info/images/unlimited-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/hack-para-coin-master-sin-verification_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-use-redstone_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-hack-2021-without-verification_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/download-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/minecraft-free-download-unblocked_GM479516143.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-daily-free-spins-link_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-hack-apk-33-download_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-100-spin_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/tiktok-free-crowncom_GM835599320.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/free-spin-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://aviaprofsoyuz.info/images/coin-master-free-spins-link-2021-no-verification_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
stream_003_off000049a3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49A3 27092 bytes
SHA-256: a4405d0fffbf3b6b10f38e8f48bded605f3dc086eacb12503243d7581b77dbf0
font_01_sfnt_off000088a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88A7 5596 bytes
SHA-256: 9a13c2580265a78e8a7257496a31ee0055738af7e20a5661c2902efe4bf05ce5
font_02_sfnt_off0000954e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x954E 18276 bytes
SHA-256: d7491fe45cc88596c87233a963b6162720bf27c142cea717df16fbc09fa29ea6

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