Malicious PDF — malware analysis report

Static analysis result for SHA-256 de0dd9413220e14c…

MALICIOUS

PDF

33.1 KB Created: 2021-07-03 21:49:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 70f93a9524b1056c7e2e4080e04ac368 SHA-1: 176e13af430c713b8a95e8edeb63af66cef87526 SHA-256: de0dd9413220e14c554bbc6ce3808d838ac453b2c45ee5b45af95b93f55d24b4
160 Risk Score

Malware Insights

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

The PDF document contains multiple embedded links that lure users with promises of free game hacks and Robux. These links redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the nature of the lure and the embedded links suggest an attempt to exploit user interest for malicious purposes, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/479516143/is-windows-10-minecraft-free-game-hack In PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-codes-unused-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/roblox-mega-gift-hack_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-icu_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-codes-2021-july_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/bloxburg-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/blox-fun-info_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/cute-free-roblox-outfits_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-robux-com-real_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-working-roblox-robux-codes-2021_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-can-we-get-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/how-to-get-5-free-robux-doing-nothing_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/hackear-coin-master-sin-root_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/obbys-august-2021-free-robux_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/free-roblox-pokemon_GM431946152.pdfIn PDF document text
    • http://lib.fisipumt.ac.id//repository/coin-master-gold-cards-hack-english_GM406889139.pdfIn PDF document text
    • http://lib.fisipumt.ac.id/repository/apps-that-give-free-robux_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_off00002cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CFA 21780 bytes
SHA-256: 38a1e0574c0e58859757486d25b943a0dc07244944792133ecc8feb575fa0989
font_01_sfnt_off00005cd7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5CD7 18812 bytes
SHA-256: 795ae3ebf2bfce0508551fd24479ee4d73c8e3f4f24f2aa99123c4f9f232ba43

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