Malicious PDF — malware analysis report

Static analysis result for SHA-256 8319946bcf070d48…

MALICIOUS

PDF

43.7 KB Created: 2021-05-14 08:35:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b665d569eee4554015a54bd7ca297d4a SHA-1: c3bf7bb2d43a663669e166ffee0348cef39cd5cc SHA-256: 8319946bcf070d489d510d63f8d628cfea2dce5d96605606b544b5de7f3c2acf
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. 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 0.9969

Heuristics 6

  • 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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-generator-2021-game-hack PDF link annotation
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-spins-on-coin-master-2021-ios_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-free-spins-daily-fb-champion_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-800-robux_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-hack-that-actually-works_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-coin-master-hack-no-verification_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-free-spins-and-coins-hack_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-nintendo-switch_GM479516143.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/today-free-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-robux_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-free-spins-on-coin-master-2021-links_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/robux-only_GM431946152.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/how-to-get-free-spins-and-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/coin-master-hack-no-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://www.shoppingmart.ie/uploaded_files/userfiles/files/minecraft-free-download_GM479516143.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
stream_003_off00004ed6.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4ED6 24428 bytes
SHA-256: 9b2a5b8823d8565f5a1a5ef3582d82adc9f7c062ba03540072047b06fc9a4c1b
font_01_sfnt_off000086e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86E8 18748 bytes
SHA-256: fca1806ffff7593a0a2d811b077fe14576afb362c0c2e8ffc695fbf8edc3964d

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