Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b8ed64cc79d11b7…

MALICIOUS

PDF

35.7 KB Created: 2021-07-03 19:36:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 918abdcd68c19fe13dad7f1c01571e17 SHA-1: 658966da95847995dd6e773af0ad250dd5362038 SHA-256: 1b8ed64cc79d11b74c1611802e59b08e3ea674a277b3a344a92867cd3c14084c
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links to malicious redirectors, masquerading as 'Robux Generator' or 'game hack' tools. The primary link, http://netcdn.tw/app/431946152/robux-generator-no-verification-2021-game-hack, is identified as a known malicious redirector. The document's content and embedded links strongly suggest a phishing or social engineering attempt to trick users into downloading further malware. No scripts were extracted, but the PDF structure itself facilitates the malicious 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/robux-generator-no-verification-2021-game-hack In PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-builders-club-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spin-sites_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/phantom-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/hack-web-tool-roblox-descargar-gratis_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-robux-hack-2021-pc_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/coin-master-free-spins-and-coins-for-iphone_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/use-cheat-engine-on-roblox-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-jump-hack-cheat-engine_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/minecraft-bedrock-edition-pc-download-free_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/how-to-get-free-roblox-codes-2021_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-links-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/extension-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/game-explorer-roblox-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/all-minecraft-handbooks_GM479516143.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/can-you-get-banned-on-roblox-for-using-cheat-engine_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/roblox-need-for-speed-cash-hack_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-working-roblox-exploits_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/free-pro-tiktok_GM835599320.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/bleu-roblox-exploit-free_GM431946152.pdfIn PDF document text
    • http://opac.akafarma-aceh.ac.id/repository/blox-land-free-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_off00003305.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3305 22496 bytes
SHA-256: ff8209e4c61c522394e07e518db846fa2b22c87ee12260d0e57753dcfe137340
font_01_sfnt_off0000656b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x656B 19312 bytes
SHA-256: e87996554a28625538ac949b95fe0d935b31d0f90cb91e6b9a3bc1e079d88d16

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