Malicious PDF — malware analysis report

Static analysis result for SHA-256 de6e17a829d71d4b…

MALICIOUS

PDF

34.9 KB Created: 2021-06-22 05:11:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 9bcf535d737ffd6235a9d627ce2951a6 SHA-1: 964f2088ca1ef74c3b0ddd09385562763af52192 SHA-256: de6e17a829d71d4bbf39ceb6eb1a930ff97b4726d9ae65b3116afa25d9301479
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a critical heuristic firing for a game hack redirect lure, pointing to known malicious infrastructure. The document body, though partially corrupted, includes the malicious URL and references to 'free generator' and 'game hack' themes, reinforcing the lure. The ML classifier also strongly flagged this PDF as malicious. The primary attack vector is likely spearphishing attachment, leading the user to a malicious redirector.

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.co/app/835599320/tiktok-free-unlimited-likes-game-hack In PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/coin-master-spin-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/earn-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/how-to-start-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/coinmaster-twitter_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/how-to-generate-free-coin-master-spin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/robux-generator-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/claim-gg-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/roblox-codes-for-free-stuff-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/do-free-robux-sites-work_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/minecraft-mod-updater_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/how-to-get-free-stuff-on-roblox-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/fbchampion-com_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/real-no-hummon-verification-robux-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/minecraft-free-version_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/robuxglobalcom_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/bloxpage-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn1wonogiri.sch.id/__statics/gudangsoal/files/coin-master-pet-food-hack_GM406889139.pdfIn PDF document text
    • http://www.tiktok.com/fypIn PDF document text
    • https://hackernoon.com/tiktok-free-fansIn 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_off00003439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3439 21956 bytes
SHA-256: cfa8f25b472da0d4abeeb7ca46f881eb7dd435a04f29f990ef2f9c32a29053ce
font_01_sfnt_off000064b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B9 18664 bytes
SHA-256: eb52e63f23dca57d0a2842bb3b43b2a88c79e8151911f99ad74b474f33b44642

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