Malicious PDF — malware analysis report

Static analysis result for SHA-256 b853784cc6a14e63…

MALICIOUS

PDF

44.0 KB Created: 2021-06-04 02:07:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 6dc8af4815319490eb08d533cfc4d8ac SHA-1: 97f5c9b57b8f950ded93bb8e7da2f02540a55c11 SHA-256: b853784cc6a14e63057560fa34edcace3f69407c4b2fded61ccf5c211bbde088
162 Risk Score

Malware Insights

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

The PDF contains multiple links to websites that promise game hacks and free in-game currency, a common lure for malware distribution. The heuristic 'PDF_GAME_HACK_REDIRECT_LURE' and the presence of numerous similar URLs strongly indicate a malicious intent to redirect users to potentially harmful content. The document body, though partially corrupted, also contains references to game hacks and URLs, reinforcing this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 6

  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.online/app/431946152/roblox-free-draw-game-hack PDF link annotation
    • http://digilib.iailm.ac.id//repository/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-minecraft-java-edition-codes_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-spins-coin-master-cheat_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/apps-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/minecraft-build-hacks_GM479516143.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/freespinandcoinblogspotcom-2021-11-coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/roblox-com-www_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-gift-link_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/pubg-uc-no-human-verification_GM1330123889.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/totally-free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/who-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/free-daily-coin-master-coins_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/robux-now_GM431946152.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/coin-master-daily-spin-free_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id//repository/free-daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://digilib.iailm.ac.id/repository/how-to-get-pokecoins-in-pokemon-go-free_GM1094591345.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_004_off00004f26.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F26 24976 bytes
SHA-256: ef634daf98aa85b31ab0d23ca19882cf988ce1ba937a3f740ee87cac791da53c
font_01_sfnt_off000088bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88BB 18508 bytes
SHA-256: d43aad8391cc92c6a460772e2941ce4b971725fdced8eeeb4fc6fe10188b1862

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