Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5c8f38b35dff7e…

MALICIOUS

PDF

43.0 KB Created: 2021-05-11 22:37:54 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c7b6a7fa947c3fb95ac89d763b33e249 SHA-1: 23f1f51b2153943f21427bc7455c1871475e3794 SHA-256: 3b5c8f38b35dff7e51c5401f789a4e41c05df5cd6d0f68d44dfc180742587562
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that redirect to malicious infrastructure, specifically promoting "game hacks" and "free Robux". The presence of a visual download button and the ML classifier's high confidence score indicate a malicious intent to trick users into visiting these sites. While no scripts were directly extracted, the PDF structure itself facilitates the redirection, likely leading to further malicious content or downloads.

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/robux-download-game-hack In PDF document text
    • http://libsmpn1balongpo.sch.id//repository/sb-game-hacker-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/funbloxxyz-free-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-do-you-get-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/synapse-roblox-free_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-hacker-us_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-without-human-verification_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/static-moonactive-net-rewards-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-hack-mod-apk-android-1_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/easy-robux-generator_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/haktuts-free-spins_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/wurst-client-112-2_GM479516143.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-34-4-hack-download_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-game-hack-link_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/roblox-hack-site_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/coin-master-free-spins-link-no-verification-2021_GM406889139.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-robux-generator-for-roblox-2021_GM431946152.pdfIn PDF document text
    • http://libsmpn1balongpo.sch.id//repository/free-coins-for-flip-master-online_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
stream_003_off00004a1d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A1D 25476 bytes
SHA-256: 151f04923d5f21fedaa60d88ef86c9a8514fdc8f0131dcbc2e0d5e46558b8da8
font_01_sfnt_off00008431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8431 18656 bytes
SHA-256: 643f530bc401710360b2f74e2e590a7f6ab15445ebda3165faa7e078ea1fa698

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