Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1d5f5f73daadcc5…

MALICIOUS

PDF

34.9 KB Created: 2021-06-20 04:14:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d186446eeea399059fbccc9aaaf64f8b SHA-1: 257f85ab5d3ad0807006b6c73b3f9815333e1061 SHA-256: a1d5f5f73daadcc54933ea5cb3d8e3b26ba356452ac9dcb59d98f0219b37490d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure for free game currency ('Robux') and game hacks, directing users to a malicious redirector URL. The ML classifier strongly flagged this PDF as malicious, and heuristics indicate it links to known malicious infrastructure. No scripts were extracted, but the document body and heuristics suggest a phishing or scam attempt.

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/431946152/10-easy-ways-to-get-free-robux-game-hack In PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/hack-coin-master-android_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-for-free-games_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/watch-tiktok-for-free_GM835599320.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/robux-generator_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/minecraft-pe-hack-client-ios_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-games-to-play-for-free_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-to-get-free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-coin-master-spins-daily_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/how-add-robux-to-used-roblox-card-cheat_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-pastebin-javascript_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/roblox-royale-high-diamond-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/can-u-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-robux-without-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-earn-robux_GM431946152.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/noob-vs-pro-vs-hacker-vs-god-minecraft_GM479516143.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/coin-master-daily-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • http://library.fk.upnvj.ac.id/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002e9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2E9D 22868 bytes
SHA-256: a4dabf0663aab7230badc3a992b87ed3921712af19108487f6fa5879a2a69977
font_01_sfnt_off0000621a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x621A 19476 bytes
SHA-256: 51808a871a7a5cb0fbff788658cfd4f440c95bbecd998adfcec1a5f604c9668c

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