Malicious PDF — malware analysis report

Static analysis result for SHA-256 c86c1f77ef084c34…

MALICIOUS

PDF

46.4 KB Created: 2021-06-03 05:36:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 8dd483af7cbe292d3fce1384027588e0 SHA-1: 1a91bfb174d6676fbef6d119312481e93623a918 SHA-256: c86c1f77ef084c347ba85a07ac1c11ed172db82adb7d82f8b9b139702b798014
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 0.9832

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.online/app/431946152/free-roblox-accounts-with-robux-2021-game-hack PDF link annotation
    • https://library.sdksantamariabwi.sch.id/repository/are-tiktok-free-views-without-verification_GM835599320.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-hack-app-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-claim-free-spins_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/but-link-says-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/tiktok-free-followers-and-likes_GM835599320.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/mcpe-master-hack-unlimited-coins-latest-version_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/download-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-games-like-minecraft_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-generator-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-online-free-download_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-free-no-virus_GM479516143.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/50-free-tiktok-likes_GM835599320.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-hack-tool-v1-9-download-free-pc_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/coin-master-free-spins-hack-without-human-verification_GM406889139.pdfIn PDF document text
    • https://library.sdksantamariabwi.sch.id/repository/minecraft-pe-free-download-android_GM479516143.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_004_off00005227.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5227 27364 bytes
SHA-256: 964f324e029d8ad5454003b7787a902a6826cbad1df3c2410578826f083f1218
font_01_sfnt_off00009089.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9089 19076 bytes
SHA-256: c054b0c192e62aa8d18573c4a3caef3c11adbf34d317da17e190ba3718f8ceb0

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