Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbd97ac80903404…

MALICIOUS

PDF

47.0 KB Created: 2021-06-07 11:15:11 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c88d35fa27f8c686780f05669fdd41c1 SHA-1: 129a8aadac51facf1088239ff45bd382ddac66c3 SHA-256: 4fbd97ac80903404bd50418db04988a4c9065b2fc27db2733392fb9285c3dd9c
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one identified as a malicious redirector leading to a 'game hack' lure. The presence of a visual download button and instructions for a password-protected archive suggest a workflow designed to trick users into downloading and decrypting a malicious payload. Although no scripts were explicitly extracted, the document's structure and embedded URLs strongly indicate a phishing or social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

Heuristics 5

  • 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.
  • 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
  • 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.tw/app/431946152/how-to-speed-hack-on-roblox-sword-fighting-tournament-game-hack In PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-free-link_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/hack-para-android-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/coin-master-hack-without-verification-code_GM406889139.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/is-pokemon-go-free-on-ios_GM1094591345.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-minecraft-bedrock_GM479516143.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-dominus-free_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-get-free-robux-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/robux-hack-no-verification_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-real_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/tiktok-free-view-github_GM835599320.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/how-to-scam-on-roblox_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-robux-hack-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/free-roblox-account-username-and-password_GM431946152.pdfIn PDF document text
    • https://library.sttbandung.ac.id/repository/play-minecraft-free-online-no-download_GM479516143.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_off0000525b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x525B 27788 bytes
SHA-256: e2e3c16ce280fd8fe484280f1462ee4de8b5253eca6cc2f7496ce0319c018adf
font_01_sfnt_off000090b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B2 19940 bytes
SHA-256: 402976013db4e3059614ef2c6d5ea0aac22ff671979d29c1beed6ece7e3f7f70

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