Malicious PDF — malware analysis report

Static analysis result for SHA-256 77d4c87331f83b51…

MALICIOUS

PDF

41.6 KB Created: 2021-05-15 10:02:55 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 41ef24c19471204aedacc8e2ef638304 SHA-1: 646f627e363e0b084de41058f3829e44842e5826 SHA-256: 77d4c87331f83b510d520bfbec8046565ed700c72b1cee8a02f6eb2593a318c2
82 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded URLs that lead to websites offering game hacks and free currency, a common lure for phishing or malware distribution. The ML classifier strongly indicated maliciousness, and the document body explicitly contains the primary malicious URL. While no scripts were extracted, the presence of these lures and the high ML score suggest the document is designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/406889139/free-daily-spins-coin-master-2021-game-hack PDF link annotation
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/minecraft-free-android_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-fan-page_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/minecraft-menu_GM479516143.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/instagram-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-spins-coin-master-legit_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-free-food-for-pet_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spin-and-coin-link_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-hack-coins_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coinmasterhack-club_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-iphone_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/robux-free-com_GM431946152.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-hack-app-download-free_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.man5-bogor.sch.id/__statics/gudangsoal/files/how-to-get-stuff-that-cost-coins-free-mcpe-master_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_off000049e9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49E9 23304 bytes
SHA-256: ee0b300121a1e953869318dd954472ee3ec75c614876d78a55d4ca4ead256687
font_01_sfnt_off00007e9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E9E 18708 bytes
SHA-256: c65851a3c2ccf8ba249fbb480ab00bab2dc65c52c70fe6f18183c59a9b34b022

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