Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9c5fa17a9737f8d…

MALICIOUS

PDF

33.4 KB Created: 2021-07-05 21:31:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 3eabf1e7a0cbac5a318ee914e5eebcca SHA-1: 3bb4e784a595dd5abcf9345266908d11fbd306d2 SHA-256: c9c5fa17a9737f8d7e65c423c854966bbd751136e17d0319ab71c45bde6b84ed
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links designed to lure users into clicking on offers for free in-game currency or hacks. The primary link, http://netcdn.tw/app/431946152/free-robux-offers-game-hack, is identified as a malicious redirector. The document's structure and embedded URLs suggest an attempt to drive traffic to potentially malicious websites, likely for phishing or malware distribution.

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-offers-game-hack In PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-hack-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-level-6-roblox-exploit_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/robux-for-kids_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-boost_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/hacks-for-roblox-island-royale-for-money_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-get-free-robux-in-pc_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-do-you-get-free-roblox-money_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-unlimited-coin-master-online-tool_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/coin-master-unlimited-spins-hack_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-fire-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/roblox-free-robux-codes-pastebin_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-to-hack-roblox-and-get-infinite-health-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-com-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/raindrop-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://perpus.stikesphi.ac.id/repository/face-free-roblox_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_off00002ca4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2CA4 22376 bytes
SHA-256: d9044405bfa2ec830e79e2a1aca5c860322d424b0e668cc10435eafdc2f3f2aa
font_01_sfnt_off00005e4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E4B 18716 bytes
SHA-256: b2a17d22e67b04b75eef1a0c9ed7c6f3b11f989c46ee80bf4c682aeec2a97972

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