Malicious PDF — malware analysis report

Static analysis result for SHA-256 a55aae3c93841f16…

MALICIOUS

PDF

35.2 KB Created: 2021-06-28 18:16:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 91048c0ffc6bc63db992d0ee093424cf SHA-1: ceb67ccb56a1252c902728d400377893d82a9895 SHA-256: a55aae3c93841f1616774f38f2680f5609fd732a85d9f06bcff8aa02ce56075d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a prominent link disguised as a 'Robux Hack' or 'game hack' generator. This link, http://netcdn.co/app/431946152/robux-hack-no-spam-filter-game-hack, is identified as malicious and part of a redirector infrastructure. The document's content and heuristics strongly suggest a phishing or scam attempt to lure users to malicious websites.

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.co/app/431946152/robux-hack-no-spam-filter-game-hack In PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-2021-android-apk_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/como-hackear-coin-master-gratis_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-old-avatar_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/como-hackear-roblox-facil_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-without-human-verification-and-no-survey_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/regal-world-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-earn-robux_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-hack-mod-apk-35-8_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/robux-download_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-game-download-free_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-minecraft-worlds_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/free-robux-group_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/roblox-necklace-t-shirt-free_GM431946152.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coins-master-hack_GM406889139.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/how-to-play-minecraft-for-free-on-computer_GM479516143.pdfIn PDF document text
    • http://digilib.stie-yppi.ac.id/repository/coin-master-gifts_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_off00003041.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3041 22632 bytes
SHA-256: fcc272b002c0154d0a8a5eeb184c6a22011eb5906ba0e337dc879da83a6cf0ee
font_01_sfnt_off000062f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x62F4 19620 bytes
SHA-256: c9aff6b26bd641277942d4184541883479f601f0f30b831203b497894b948763

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