Malicious PDF — malware analysis report

Static analysis result for SHA-256 0406c76202b5186e…

MALICIOUS

PDF

34.5 KB Created: 2021-07-07 20:08:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: b5012924d2641dacbd056d62dc41136a SHA-1: bb1d7e7161b96ee7fa76e1b9165b5823c84c422d SHA-256: 0406c76202b5186e5b1770d9327157e0b603bfdb07d46bcb220c11c029c60cef
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/406889139/coin-master-free-spins-apk-game-hack PDF link annotation
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/robux-hacks-no-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/how-to-get-more-followers-on-tiktok-free_GM835599320.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/minecraft-pe-hack-client_GM479516143.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/free-spins-coin-master-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/free-spins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/coin-master-free-spins-link-today-new_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/free-robux-from-gravel-pit_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/como-tener-1-millon-de-robux-el-hacker-2021-pro_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/300-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/how-to-get-any-roblox-shirt-for-free_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/microsoft-rewards-robux_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/how-to-hack-roblox-accounts-2021-new-method_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/how-to-get-free-robux-hack-on-tablet_GM431946152.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/coin-master-free-download-app_GM406889139.pdfIn PDF document text
    • https://www.mahabircreation.com/uploaded_files/userfiles/files/roblox-free-clothes-hack_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_off000031f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31F6 22388 bytes
SHA-256: aef72efd4979faaae51e7a8ad256a06e1e505f12d05556bf3fcf4c530c79b4f0
font_01_sfnt_off000063d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63D3 18344 bytes
SHA-256: 1dbe0fcba05c02502e584b0e7ffab6a4f048fc487afe950fa18a3df4b6395c6f

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