Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e57bee5598199f0…

MALICIOUS

PDF

42.7 KB Created: 2021-05-15 00:27:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 6d7f67d9752ba159aab767e0c616abad SHA-1: 917d1fb2186679d76016fe4735549edcf60afae4 SHA-256: 1e57bee5598199f0f6e70efb0db07df1fd41781cfef0466a90a42f2a20662bc8
122 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file 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 0.9971

Heuristics 5

  • 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/robux-hacks-2021-game-hack PDF link annotation
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/how-to-get-roblox-money_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/roblox-rewards_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-modded-minecraft-server_GM479516143.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/roblox-people-girl_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/blogspot-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-roblox-injector_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/robux-com-free_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/roblox-prison-life-hack_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/how-to-get-minecraft-coins-for-free_GM479516143.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-free-spins-link-may-2021_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-spins-free-2021_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-robux-websites-2021_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-robux-generator-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-daily_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/play-coin-master-online-free_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/coin-master-hack-apk-ios-download_GM406889139.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/free-robux-please_GM431946152.pdfIn PDF document text
    • https://www.mjcorporatemall.com/uploaded_files/userfiles/files/earn-robux-now_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
stream_003_off00004947.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4947 25156 bytes
SHA-256: 5686d850e6086fedd4749b3041c5b18e6b81fc051327331c3f0e07022f6d7cd7
font_01_sfnt_off00008328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8328 18648 bytes
SHA-256: 03ab0df94635c5ebeb05191dd2fda9aa410ed650044dc459735f8f7cc99ee4ee

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