Malicious PDF — malware analysis report

Static analysis result for SHA-256 683b8af9364b7812…

MALICIOUS

PDF

44.2 KB Created: 2021-05-10 21:31:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: fcf447d705a089c2c2c6ced761ee7d05 SHA-1: 154a22676015c1b4c71de344d839cc0251390cf8 SHA-256: 683b8af9364b781243fd743f7d05c0ec5780bbf1815a343a1930901017e258b7
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks. The document body and embedded URLs strongly suggest a phishing or scam attempt designed to trick users into visiting potentially harmful sites. While no scripts were directly extracted, the PDF structure and embedded URLs are indicative of a malicious lure.

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 https://netcdn.xyz/app/431946152/free-robux-without-human-verification-game-hack In PDF document text
    • http://repository.ummy.ac.id//repository/blox-world-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-spin-and-coin-blogspot-com_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-2021_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-switch-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/hack-coin-master-apk-32_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-items-codes_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/roblox-admin-hack_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spins-app-android_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/links-to-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/minecraft-apk-android-free_GM479516143.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-cheats-for-free-spins_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-robux-site_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/free-roblox-characters_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-free-spin-link-daily_GM406889139.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/game-give-free-robux_GM431946152.pdfIn PDF document text
    • http://repository.ummy.ac.id//repository/coin-master-daily-free-spins-and-coins_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
stream_003_off000049b2.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49B2 27952 bytes
SHA-256: dcfae22d2a6557d3c90fa9ce1012446f5721d03f698e09259e5f4253f8e8b5e7
font_01_sfnt_off0000880b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x880B 19224 bytes
SHA-256: 69162c0303826e3a88150cee7b6b12b50ba56e04bc46253c0e5eb9f80ac8a399

Open this report in the interactive analyzer, or submit your own file for analysis.