Malicious PDF — malware analysis report

Static analysis result for SHA-256 54bb42e908e0211c…

MALICIOUS

PDF

47.3 KB Created: 2021-06-08 23:06:42 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 5284f10e25aaa79f3258182af9bb7dc8 SHA-1: 4b533c64e9a02eae4a33f70a5bc310cfe2f1df70 SHA-256: 54bb42e908e0211cda7f853ae43235e6f9b1f720d91e36a9a743ec2fb6b1c3fd
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a fake CAPTCHA lure to deceive users into clicking malicious links. The primary link redirects to a known malicious domain, suggesting an attempt to download further malware or phish for credentials. Multiple other URLs pointing to potentially malicious PDF files were also extracted, indicating a broader campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9769

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.
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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-apk-hack-robux-game-hack In PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-and-spins-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-online_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/krnl-download_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/huskybuscom-free-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/pubg-uc-unipin_GM1330123889.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-pe-server_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-online-generator_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-link-daily_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-spin-link-for-coin-master-haktuts_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-hack-apk-with-fb-login-2021_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-minecraft-java-code_GM479516143.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-coins-link-2021-deutsch_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-hack-roblox-and-get-robux-on-first-attempt_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/coin-master-free-link-spin_GM406889139.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/how-to-get-free-robux-easy-on-phone_GM431946152.pdfIn PDF document text
    • http://lib-smansumsel.sch.id/repository/roblox-comroblox_GM431946152.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_off00004edd.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4EDD 24936 bytes
SHA-256: b1ce416ca242d2218ac1d2d40684d2ef90e79dff56b466551ae906e8f01ee85e
font_01_sfnt_off00008842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8842 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off00009554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9554 18500 bytes
SHA-256: 935d3280389938c65d2521acbdefd0c6dde21bc0b0479bfbaabebf347501b691

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