Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f7bb3c3883ebc1c…

MALICIOUS

PDF

43.7 KB Created: 2021-06-03 22:33:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: d81153e8b5dd72a5a79af81994d5fa1d SHA-1: 3ae2024307297a3492f22f5cb7ec67b424202ecf SHA-256: 8f7bb3c3883ebc1c9c97c15e12ad987d60c7059fd81bfd59c375155ff0850067
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links to redirectors and known malicious infrastructure, specifically promoting 'game hacks' and 'generators'. The primary lure directs users to 'https://netcdn.online/app/431946152/kuso-icu-roblox-hack-game-hack', which is flagged as a malicious redirector. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to trick users into downloading further malicious content, likely through a social engineering pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/kuso-icu-roblox-hack-game-hack In PDF document text
    • http://digilib.uim.ac.id/repository/free-coin-master-gifts_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/coin-master-free-cards-2021_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/hacks-for-roblox-jailbreak_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-hack-roblox-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox-jailbreak-hack-download_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/roblox36com-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/mcpe-master-coins-hack_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • http://digilib.uim.ac.id/repository/cool-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/freespinandcoin_GM406889139.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/free-robux-place_GM431946152.pdfIn PDF document text
    • http://www.digilib.uim.ac.id/repository/minecraft-book-collection_GM479516143.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_off0000502e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x502E 24456 bytes
SHA-256: f0b4b2131de3097982f2298cccff3bb9b26e8dcc3b6dc22b6ef1512404dd5a05
font_01_sfnt_off000087ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87EE 18320 bytes
SHA-256: 67b96beca271d5ff8db6d4205f4bcb305d403275eb03eb731bd8bb208d3be0d2

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