Malicious PDF — malware analysis report

Static analysis result for SHA-256 b43817ac1a9987f5…

MALICIOUS

PDF

47.4 KB Created: 2021-05-17 06:16:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 76a915182a0104e173ccd83701554bbc SHA-1: 9f56115d610fbbb3d2c46247fb2b3a939e848345 SHA-256: b43817ac1a9987f5bfd8d2802d57a0a0213735294be86ba99fdde8b16f1d5fc7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' or 'game hacks'. The presence of a download button lure and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful sites. No scripts were extracted, but the document's structure and embedded URLs strongly suggest a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9013

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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-codes-no-verification-2021-game-hack In PDF document text
    • https://www.audev.com/images/how-to-get-free-robux-easy-no-download_GM431946152.pdfIn PDF document text
    • https://www.audev.com/images/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/how-to-get-free-coins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://audev.com/images/coin-master-hack-2021-apk-download_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://audev.com/images/how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.audev.com/images/coin-master-hack-without-human-verification-india_GM406889139.pdfIn PDF document text
    • https://audev.com/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • https://audev.com/images/free-robux-survey_GM431946152.pdfIn PDF document text
    • https://www.audev.com/images/minecraft-free-download-2021_GM479516143.pdfIn PDF document text
    • https://www.audev.com/images/how-to-add-mods-to-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://audev.com/images/free-robux-codes-2021-real_GM431946152.pdfIn PDF document text
    • https://www.audev.com/images/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/coin-master-free-coins-link-march-2021_GM406889139.pdfIn PDF document text
    • https://audev.com/images/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://audev.com/images/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://audev.com/images/cheats-coin-master-free-spins-and-news_GM406889139.pdfIn PDF document text
    • https://www.audev.com/images/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004a83.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4A83 24820 bytes
SHA-256: 1aed68d029cce5b334fbc8efc7f848b0b18ce79312ce92bd218ffc747724e113
font_01_sfnt_off00008265.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8265 7272 bytes
SHA-256: f462303657ce1de10d3e7d5ae1fe17c8584116bd5bc216971166de87266da924
font_02_sfnt_off000093d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x93D6 19176 bytes
SHA-256: db1e34f64d78c47646929d75ef8e7d82dfccacc985d29653851fea35b3c0bf96