Malicious PDF — malware analysis report

Static analysis result for SHA-256 5351cb4952a629f9…

MALICIOUS

PDF

46.9 KB Created: 2021-06-09 05:32:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: b67f72074eb3066746d684045238bc65 SHA-1: 70a61e560c943c39ecedb32a2765c419b7f3d1cb SHA-256: 5351cb4952a629f9ddedee60e5f897a9ba88e1343ca7ea99d857cc804db69c93
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1539 Steal or Forge Credentials

This PDF document contains links that redirect to known malicious infrastructure, likely as part of a phishing or scam campaign. The presence of an MFA lure suggests an attempt to harvest credentials or session tokens. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious workflow designed to trick users into clicking through to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9768

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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/roblox-booga-booga-cheat-engine-game-hack In PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-rewards_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-gold-cards-link-2021ee-spins_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-download_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/robux-hacks-2021_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/roblox-hack-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-2021-no-survey_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/mcpe-master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/cheat-engine-roblox-dbor_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-wings_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-400-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-accounts-with-robux-that-work-not-banned_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/free-robux-apk_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-to-make-a-minecraft-server-for-free-java_GM479516143.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-spins-ios_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/how-do-you-get-roblox-for-free_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://elibrary.smknesbu.sch.id/repository/download-hacked-games-coin-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_004_off000050da.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x50DA 29424 bytes
SHA-256: 97f02399a6581d90274cc624b39de681a010b988becc9f21dfe0d9c06ce10e6d
font_01_sfnt_off00009281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9281 19000 bytes
SHA-256: c362851f606cf29e832110858702f2e24b0cb7b6c2a848acac7c50542cd32b2d

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