Malicious PDF — malware analysis report

Static analysis result for SHA-256 51f3d3fd15e8e0dd…

MALICIOUS

PDF

35.2 KB Created: 2021-07-09 04:55:09 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 4785786ad9cce3af170603554353bdd1 SHA-1: 09dce56838f8737792ca9929c003efe202dc0c32 SHA-256: 51f3d3fd15e8e0dd103bb8d8e9ac8941d5dd7e2a5273e38b5fa8f9841f6e3506
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 pointing to a lure for 'free generator / game hack'. The document body also contains the same URL, reinforcing the malicious intent. The ML classifier strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious redirector link suggests the document is designed to lead the user to download further malware.

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/479516143/how-to-hack-minecraft-game-hack In PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/roblox-fortnite-island-royale-free_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/how-to-get-free-roblox-gift-cards_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/fan-page-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/free-robux-today_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/synlapse-roblox-free-download_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/roblox-rocitizens-cheat-codes-may-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/roblox-money-hack_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/microsoft-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/free-robux-codes-not-used-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/free-card-giver-roblox-jailbreak-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-verifying_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/free-roblox-codes-june-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsn3lebak.sch.id/__statics/gudangsoal/files/unlimited-spin-coin-master-hack_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_off0000333d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x333D 23188 bytes
SHA-256: 27d7eeefcdbffe758bf23c24ab5f40a230b9f126f90e4cc0cbd91757e660428d
font_01_sfnt_off000066c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x66C2 18332 bytes
SHA-256: 532c884a4d8ab194113d3323d4275cc83154e954f62235f4e0d0243afa765cb8

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