Malicious PDF — malware analysis report

Static analysis result for SHA-256 b135301b7f5214c6…

MALICIOUS

PDF

34.9 KB Created: 2021-07-05 12:31:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 72ed82672a38a585d253fe7bb241b35b SHA-1: b1041b9c42184ab19db4f759cc4c3e42a82378dc SHA-256: b135301b7f5214c6fe09602150d66f470498788fdab33bbef1477638412833d4
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to redirector infrastructure, specifically advertising 'free Robux' and 'game hacks'. The primary redirector URL is http://netcdn.tw/app/431946152/free-robux-instantly-game-hack, which is associated with malicious activity. The document body and embedded links suggest a lure to download potentially malicious content or visit further compromised sites. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/free-robux-instantly-game-hack In PDF document text
    • http://library.umla.ac.id/repository/hack-my-roblox-account_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/we-hack-robux-generator_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-spins-activegamer_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/haktuts-coin-master-today_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id//repository/coin-master-free-coins_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-hack-someones-account-on-roblox_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-people-girl_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/minecraft-dungeons-free-download_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/how-to-pubg-uc-carding_GM1330123889.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-hack-minecraft-pe_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/easy-robux-today-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/free-roblox-boy-hair_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/robloxfun-com-robux_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id//repository/how-to-get-minecraft-for-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-free-gifts_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/coin-master-mod-apk-free-download-for-android_GM406889139.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-free-models_GM431946152.pdfIn PDF document text
    • http://library.umla.ac.id/repository/roblox-hack-for-high-rank_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_off00003030.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3030 22784 bytes
SHA-256: 91a993451676d83642d64c7ef72e522c4efe944dd4a681d539fc6c394fb64b77
font_01_sfnt_off0000632c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x632C 19072 bytes
SHA-256: 2ca9d11195de567abf4a703037006073732e9aee935d3c5754ca148439903055

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