Malicious PDF — malware analysis report

Static analysis result for SHA-256 48ccb573f4292b9e…

MALICIOUS

PDF

36.8 KB Created: 2021-07-19 10:49:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: cd5ba72cfba4b8fcfca851945399cba8 SHA-1: a79af25aab7863f0deef78556eb4e05824202672 SHA-256: 48ccb573f4292b9eadb778a5ea21c18e93b546a843b44daf187bd8d46ce13a3f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links designed to lure users into clicking on a 'free generator / game hack' which redirects to malicious infrastructure. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to potentially malicious sites, likely for credential harvesting or further malware delivery.

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 http://netcdn.tw/app/431946152/free-robux-without-verification-game-hack In PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-windows-10-edition-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-modded-minecraft-server-hosting_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/i-got-hacked-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn12madiun.sch.id/__statics/gudangsoal/files/get-free-tiktok-likes_GM835599320.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_off00003975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3975 22488 bytes
SHA-256: 29f2573ee0eb6327082522b6df210526c24fcbb2c6e5661bbdb10989042a1424
font_01_sfnt_off00006ba3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6BA3 19152 bytes
SHA-256: 7895b126dfac826061eb5c6a40f44fc83c5a70e85f9762b018221c4de09f25d7

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