Malicious PDF — malware analysis report

Static analysis result for SHA-256 1611efd0e1e07eea…

MALICIOUS

PDF

45.5 KB Created: 2021-06-11 11:09:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: 82f6609932cbbddf3f93b8855f4502cf SHA-1: 0f8b4427c31e5bf3fa9b077342748e264ccf2562 SHA-256: 1611efd0e1e07eea25f97c0e2f8cccd570dffaa379ca9d78730af51e2c9482f6
200 Risk Score

Malware Insights

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

The PDF document contains multiple links to known malicious redirectors and impersonates brands like Facebook to lure users with promises of free Robux or game hacks. The ML classifier also flagged this PDF as malicious. The embedded URLs are designed to lead users to potentially harmful sites, likely for credential harvesting or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.tw/app/431946152/get-free-robux-using-no-surveys-game-hack.
  • 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.tw/app/431946152/get-free-robux-using-no-surveys-game-hack In PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/minecraft-reach-hack_GM479516143.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/coinmasterfree_GM406889139.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/free-apk-mods-coin-master_GM406889139.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/free-vip-server-roblox_GM431946152.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/coin-master-village-4_GM406889139.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/roblox-mobile-hack_GM431946152.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/coin-master-hack-apk-download-for-android-mobile_GM406889139.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/blogspot-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/minecraft-windows-10-hacks_GM479516143.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/legit-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/is-minecraft-earth-free_GM479516143.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/free-spins-coin-master-unlimited_GM406889139.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/robux-hack-script_GM431946152.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/how-to-hack-roblox-with-cheat-engine-63_GM431946152.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/give-me-robux-now_GM431946152.pdfIn PDF document text
    • http://www.atlanticexportsltd.com/uploaded_files/userfiles/files/master-coin-free-link_GM406889139.pdfIn PDF document text
    • http://atlanticexportsltd.com/uploaded_files/userfiles/files/coin-master-free-stars_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_off000055fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x55FE 24164 bytes
SHA-256: 54165652af993cf0372f8f80b303e0e1cc038c15886cb7aa8e48367806046876
font_01_sfnt_off00008cdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CDB 19004 bytes
SHA-256: 1ad7ebad3cbeebcaf0ad8b4c4269b1d48cb3ea23e7184a2523d3525990f24e46