Malicious PDF — malware analysis report

Static analysis result for SHA-256 279abcbbd843c044…

MALICIOUS

PDF

34.2 KB Created: 2021-07-05 05:45:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: e4d4ef8530296ccd1296d1d42b522375 SHA-1: 327ce2de29b60c6f2d94c69c0608644b030b62d5 SHA-256: 279abcbbd843c044e824349476998f9968df649d064d4df2972539a329a6dbe9
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.tw/app/431946152/free-robux-no-survey-game-hack. The document body and embedded URLs suggest a lure for free game-related items, likely to trick users into downloading malware or visiting phishing sites. No scripts were extracted, but the presence of malicious links and the ML classifier output strongly indicate malicious intent.

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-no-survey-game-hack In PDF document text
    • http://www.pspmrsmkber.com/opac/repository/is-minecraft-bedrock-free_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/coin-master-free-daily-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-tix-dominus-roblox_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/windows-10-minecraft-free-with-java_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-free-robux-com_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/daily-coin-master-spins_GM406889139.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-fun-com-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-no-human-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/como-usar-tesla-roblox-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/hack-roblox-ipod_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/infinite-robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/i-roblox-free-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-minecraft-account_GM479516143.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/how-to-get-roblox-jailbreak-hack_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/free-robux-free-gift-card_GM431946152.pdfIn PDF document text
    • http://www.pspmrsmkber.com/opac/repository/can-i-get-robux-for-free_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_off00002ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2ED7 22280 bytes
SHA-256: d98c0f02494744bed1ea60dd594b251d6a138b621b68ecf98ae6ead95c8351be
font_01_sfnt_off00006094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6094 19012 bytes
SHA-256: 4e4ee538de79ec7e4a2325d57c934275716f5f92a64f1321ae55620a5fe6760f

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