Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d9f34e86608e4c…

MALICIOUS

PDF

32.1 KB Created: 2021-06-27 16:20:41 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c5c8d64ead0026d2139d39cd030064a5 SHA-1: 1e163f6d3e8b5298741c17def91a0519ec1e72b1 SHA-256: 98d9f34e86608e4cb9f6d592b54d758092fc99160d822d6b62d7186a8b31b232
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free Robux, directing users to a malicious redirector URL. The document body and heuristics indicate a social engineering tactic to trick users into clicking the link, likely leading to a phishing site or malware download. No scripts were extracted, but the embedded URLs are the primary indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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.co/app/431946152/how-to-get-free-10-000-robux-game-hack In PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/robux-offer-wall_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-robux-codes-march-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-black-clover-roblox-accesories_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-meep-city-money-hack_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/mundschutz-download-mundschutz-free-roblox_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-vehicul-simulator-hacke_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-roblox-account-giveaway-with-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/adoptme-club-free-robux_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-spin-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/roblox-online-for-free-no-download_GM431946152.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/pubg-uc-unlimited-free_GM1330123889.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/online-coin-master-free-spin-app_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://aits.co.id/ckfinder/userfiles/files/coin-master-free-spins-for-today_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_off00002a3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A3A 21072 bytes
SHA-256: 730414caf2fbb5eb4834336bade66f6904fe46dc7135df2f8f57f16975d92263
font_01_sfnt_off000057c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x57C1 19264 bytes
SHA-256: 58a9d1cc14571d4e2d826768908c209865ab488d29c22cd13ce68099f35b85e4

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