Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73aa5077155ee7d…

MALICIOUS

PDF

48.9 KB Created: 2021-06-03 13:18:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 65fa75d8894ba470a0d2e0bfebde2c8f SHA-1: ed93cc8588fc3766f9ff861810f6003985e42814 SHA-256: e73aa5077155ee7db53f9863338c95294571dd6839b3e1a888d33055e2491073
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free generator' or 'game hack' lures. The primary malicious URL identified is https://netcdn.online/app/431946152/how-do-u-get-free-robux-2021-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a phishing or social engineering attack aimed at tricking users into visiting compromised sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9871

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.online/app/431946152/how-do-u-get-free-robux-2021-game-hack In PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-hack-roblox-accounts-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-redeem-card-codes-free_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/play-minecraft-online-free_GM479516143.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/minecraft-free-android_GM479516143.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-hack-version-download-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-accounts-2021_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/roblox-free-hats_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-hack-ios-2021_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/roblox-free-robux-website_GM431946152.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.stieimalang.ac.id/repository/100-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-game-hunter_GM406889139.pdfIn PDF document text
    • http://www.opac.stieimalang.ac.id/repository/coin-master-daily-free-spins-link-facebook_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_004_off00005001.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5001 32196 bytes
SHA-256: 3587d0cea41cf9e7c7ec4b038e4039793c6d140d1a91b6c6b77ead5144ccdb3b
font_01_sfnt_off00009a5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A5E 19040 bytes
SHA-256: 14ed63897d8c38c9b74f4ae6c685ddc963b8153977262fdb6411d06658c720a7

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