Malicious PDF — malware analysis report

Static analysis result for SHA-256 d456aef06e27ad57…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 07:29:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: d855c6f4224d2c089bc6cb7840ffc2a8 SHA-1: d7497bd76124313d5043afd40b78e969ad9a5d1e SHA-256: d456aef06e27ad57a9aa89799aa13518e1bd3b341ff1d3e78544a0d09766e68c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary malicious URL identified is https://netcdn.online/app/406889139/free-spins-on-coin-master-link-game-hack. While no scripts were extracted, the PDF structure and embedded links strongly indicate a phishing or social engineering attack, likely intended to lead users to a site that may host further malware or attempt credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/406889139/free-spins-on-coin-master-link-game-hack In PDF document text
    • https://library.elkatarie.ac.id/repository/how-do-you-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-link-2021_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-executors-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-hack-back-into-your-account-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-ad_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-coin-master-spins-no-human-verification_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-free-spins-2021-app-download_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/how-to-get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/roblox-com-free-play_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/earn-free-robux-for-roblox_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-no-verification-at-all_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/coin-master-fan-hack_GM406889139.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/free-robux-cards_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/is-it-possible-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/toolbox-for-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://library.elkatarie.ac.id/repository/minecraft-hacked-client-112-2_GM479516143.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005001.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5001 26436 bytes
SHA-256: e0a00bdf32d9c38ce09d28ead1adb607c1191c39c7b63159a434466dcd10a3c8
font_01_sfnt_off00008cf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CF3 4020 bytes
SHA-256: 7d3617ecf51e14e6cffc9372c4441988c3b6cb3ea010f7512aee6af842ef388d
font_02_sfnt_off00009a7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9A7E 18056 bytes
SHA-256: 892ebf3b86ae534fd3f474e2c239da2a9bb4dc91f8225dc09222a78aadec1336

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