Malicious PDF — malware analysis report

Static analysis result for SHA-256 c432a08b675aa829…

MALICIOUS

PDF

42.8 KB Created: 2021-05-11 05:31:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 5c55c0ddc1c764326e32dfd719d6d45a SHA-1: 52c0dc367407fa4208947dcc5ece241047205345 SHA-256: c432a08b675aa829977298d28736650ac828c64a734eefe6331156f54358acff
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, masquerading as a 'free generator / game hack' for Robux. The presence of multiple links to known malicious redirectors and the ML classifier's high confidence score indicate a deliberate attempt to lead users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a social engineering tactic to drive traffic to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://netcdn.xyz/app/431946152/free-robux-by-watching-ads-game-hack In PDF document text
    • https://opac.pasca.isi.ac.id/repository/coin-master-new-link-free-spin_GM406889139.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/facebook-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/claim-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/best-free-minecraft-texture-packs_GM479516143.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/hack-coin-master-apk-32-download_GM406889139.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/free-robux-human-verification_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/coin-master-hack-tool-exe_GM406889139.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/monttechscom-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/robux-free-gift-card-org-hack_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/how-to-get-free-pets-in-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/how-do-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/how-to-get-minecraft-for-free-on-mobile_GM479516143.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/how-to-get-free-robux-website_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/hack-the-game-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/how-to-get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/minecraft-bedrock-edition-download-pc-free_GM479516143.pdfIn PDF document text
    • https://opac.pasca.isi.ac.id/repository/roblox-free-robux-hack_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_off000048b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x48B3 24712 bytes
SHA-256: 55cc18fec776cb113fa7578f8ca3e9f2b0819786fd7916d5ab754dce9d4a9fac
font_01_sfnt_off00008172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 19472 bytes
SHA-256: 06b7c2c04a08988b26013261e09f65c94c24f523f4ae9df4e6f4943f7c42b6f1

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