Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d1a1bc20c756789…

MALICIOUS

PDF

34.8 KB Created: 2021-07-03 15:46:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: d2e2a142dc210a6638097118af08f114 SHA-1: 5402acdc3b3eb6501a480d11176b6de7384a7041 SHA-256: 1d1a1bc20c75678977a9e9d55f06a667d538c931b77a4408d24ef344ccf1b0c5
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a critical heuristic firing for a malicious redirector link, specifically advertising a 'free generator / game hack' for Roblox. The embedded URL, http://netcdn.tw/app/431946152/rbl-gg-free-robux-game-hack, is identified as a malicious redirector. The document body also contains this URL and related links, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious.

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/rbl-gg-free-robux-game-hack In PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-hack-in-every-game-in-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/rbx-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-do-i-earn-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/roblox-wings-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-kids-games-for-girls-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/blogspot-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-pet-food-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-animation-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/links-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-hacks-reddit_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/free-minecraft-server_GM479516143.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/tiktok-free-movie-website_GM835599320.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/get-free-tiktok-fans_GM835599320.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/roblox-promo-code-hack-robux_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://elearning.min12jkt.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-quora_GM406889139.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_off00003357.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3357 21840 bytes
SHA-256: b5a9b654dc2a9c182bb5a2d430db3248cde434b7405925c6970ee420ad869163
font_01_sfnt_off000063bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x63BC 18788 bytes
SHA-256: 59f9ca33a2a7e44c47b5adabbc3ceacc3a6bbd6ffe2d0380a638199fee6fbfd8

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