Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a37dafbe09f7ab2…

MALICIOUS

PDF

35.7 KB Created: 2021-06-18 20:29:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: db7ae3fcb1a13b116a9b2eb2fe23e4e0 SHA-1: a9d44675b68dc298babb93596bc1fa098eb55425 SHA-256: 6a37dafbe09f7ab2a17d3f3518288a31c459ea835c642c1f2393e932dfe7e9d5
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 0.9980

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 http://netcdn.co/app/431946152/roblox-how-to-get-free-robux-website-game-hack PDF link annotation
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-free-robux_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-hack-coin-master-with-root_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-deals_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-e-free_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/roblox-free-catalog-things_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-free-spins-a2z-help_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/free-robux-apps-that-work_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/hacking-peoples-robux_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/hacks-master-coin_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-hack-apk-no-survey_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-do-you-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/how-to-get-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/proxo-roblox-hack-key_GM431946152.pdfIn PDF document text
    • https://www.delhihomeoboard.in/uploaded_files/userfiles/files/freecoins_GM406889139.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_off00003246.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3246 23376 bytes
SHA-256: 688b5d5b495b8ea2cd1ebd878c50b771f285c98ea8560d95b6f874825866214c
font_01_sfnt_off000065f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x65F4 19192 bytes
SHA-256: eeaad46798b48cea228fb34fdea22d83110b9f03758cee97e9bbc04f3074efb5

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