Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd779692e49e684e…

MALICIOUS

PDF

36.8 KB Created: 2021-07-04 23:57:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b9bc9eb1280312a169a1a074cc8bfcab SHA-1: 81af7ed7b2c441056d4914c45e3b954e7c7553eb SHA-256: cd779692e49e684e8a2e4e28d83d820da836c93300dcfa644f02bd0256cbf4bd
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 0.9980

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 http://netcdn.tw/app/431946152/free-roblox-accounts-with-robux-that-work-2021-game-hack PDF link annotation
    • https://opac.heritagejkt.org/repository/free-robux-gift-card-codes-2021-december_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/best-free-minecraft-server-hosting-reddit_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/veorra-set-free-roblox-id_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/op-rewards-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/will-minecraft-ever-be-free_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-free-in-app-purchases_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/www-coinmaster_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/get-robux-free-no-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/roblox-prevent-fly-hacks_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/minecraft-redeem-code-free-2021_GM479516143.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/coin-master-hack-link-2021_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/roblox-hack-ios_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/shark-bite-roblox-hack_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/how-to-duplicate-coin-master-spin-hack_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/free-robux-android-no-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/nitro-fun-cheat-codes-roblox_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org//repository/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-without-email_GM431946152.pdfIn PDF document text
    • https://opac.heritagejkt.org/repository/how-to-get-free-robux-in-roblox-no-hacks-2021_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003429.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3429 23040 bytes
SHA-256: 1291d7232ce64e85472b147290d08a4546bda80bc42f9e02979fd070efcf5dda
font_01_sfnt_off00006837.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6837 19948 bytes
SHA-256: 25c875579330c816dc270a6cc831986c277f5cf3e4bf50255e97f253356454b0

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