Malicious PDF — malware analysis report

Static analysis result for SHA-256 35ce35ecee213992…

MALICIOUS

PDF

46.8 KB Created: 2021-06-03 09:51:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-20
MD5: dd391914094b1dbdab23b571fd77827e SHA-1: 9593168de18a7c3e380be6aa550ae94fe9d1e996 SHA-256: 35ce35ecee21399210fdff0f8b9355a3ed4c4bdc7077282a445eaef4c72ddc08
200 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a game hack redirector lure, impersonating the Facebook brand. It links to a known malicious redirector infrastructure. The document body, though heavily obfuscated, contains references to the malicious URL and other benign-looking PDF files, suggesting a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.online/app/479516143/simplysarc-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.online/app/479516143/simplysarc-game-hack In PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-download_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-tiktok-followers-without-verification_GM835599320.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/sites-for-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-free-spins-hack-ios_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-accessories_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-roblox-codes_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-free-minecoins_GM479516143.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-hack-tool-2021_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/chisel-and-bits-mod-minecraft-pe_GM479516143.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/get-free-robux-com_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-robux-hack-us_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/roblox-hacks-2021_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-daily-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/how-to-make-a-private-server-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-promo-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/minecraft-marketplace-free_GM479516143.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-apk_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.christchurch-burton.staffs.sch.uk/admin/ckfinder/userfiles/files/free-money-links-coin-master_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_004_off000052d5.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x52D5 30120 bytes
SHA-256: 2946f18ce01c4bb9e7eaf971029c20ff57a5c3b6d4d50757e6d15586424e10e6
font_01_sfnt_off0000953c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x953C 18156 bytes
SHA-256: d1e3c8cc46daa8b4e8a3620fd036fa3afc0951971ec214e12238e772f71f3550