Malicious PDF — malware analysis report

Static analysis result for SHA-256 284583ec39bcb7a2…

MALICIOUS

PDF

33.1 KB Created: 2021-07-05 16:04:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b034ee66e49c244ebd7c69579c8e456b SHA-1: 51379e2fbcdf0eb01eb1b968a9207946d7147ffb SHA-256: 284583ec39bcb7a2ced90c0c6b4f53c3503f9a1756ada5e305dc07f0329eddbb
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a lure for free in-game currency ('Roebucks', 'Coin Master spins') and explicitly links to known malicious redirector infrastructure. The embedded URL http://netcdn.tw/app/431946152/how-to-get-free-roebucks-on-roblox-game-hack is identified as a malicious redirector. This suggests the document is part of a phishing campaign designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

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 http://netcdn.tw/app/431946152/how-to-get-free-roebucks-on-roblox-game-hack In PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-100-spin-hack_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/pokemon-go-joystick-free-download_GM1094591345.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/microsoft-free-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-heaven_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/best-free-minecraft-servers_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/how-to-get-free-robux-without-verification-2021_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-robux-lmao_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/robux-no-survey_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-generator-robux_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/cheat-roblox-prison-brak_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/roblox-rewards-site_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/hack-exploit-for-roblox-no-virus_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-32-android-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/coin-master-cheats-2021_GM406889139.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-roblox-well_GM431946152.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/free-tiktok-followers-app_GM835599320.pdfIn PDF document text
    • https://library.sman1berau.sch.id/repository/2gunda-parte-del-hack-de-robux_GM431946152.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
font_00_sfnt_off00002af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2AF9 22064 bytes
SHA-256: b9ec091a3cb1bc0278c075798d0346bb0ce0b6e806e26c06dad8387681feac44
font_01_sfnt_off00005be9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5BE9 19228 bytes
SHA-256: e0defeb3cdfa0b2bd15f1d655f37073a2afc05a1f059c7295c9a06f93db64536

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