Malicious PDF — malware analysis report

Static analysis result for SHA-256 49ed5d45acdbc76a…

MALICIOUS

PDF

45.2 KB Created: 2021-06-09 00:14:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 264aefe4d67844d1fa66a0dd33629093 SHA-1: 264e1a4d1f0fadade1723026b8375ccd2ab3b48c SHA-256: 49ed5d45acdbc76aca245292704c05a0926d75ebd188e2aca1019ccbf8a46af1
240 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1071.001 Web Protocols

The PDF document contains multiple links to known malicious redirectors and impersonates brands like iCloud to lure users into clicking. The document body, though heavily obfuscated, contains references to game hacks and free generators, aligning with the heuristic findings of a redirector lure and brand credential phishing. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent, likely to lead users to credential harvesting pages or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

Heuristics 6

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/how-to-cheat-at-boku-no-roblox-remastered-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/how-to-cheat-at-boku-no-roblox-remastered-game-hack In PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-education-edition-free-download_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/ways-to-get-free-robux-2021_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/1x1x1x1-roblox-id_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/getrobux-come_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/roblox-redeem-robux-code-free_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-hack-pc_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-tool-hack_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/robux-how-to-get-without-glitch-or-hack_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/promo-code-free-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-links-to-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/minecraft-login-free_GM479516143.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/coin-master-free-spins-cheat_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-robux_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-get-free-robux-fast-and-easy_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/master-coin-hack-apk_GM406889139.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • http://library.itekes-bali.ac.id/repository/how-to-hack-roblox-accounts-passwords_GM431946152.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_off0000534c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x534C 24416 bytes
SHA-256: b29bae4e2fa8a45f5e18495bf36dd098fc1c5900e8f5cd082af6f02339cdfa19
font_01_sfnt_off00008b5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B5F 19192 bytes
SHA-256: 274dba111ed5cfe53a99a5ba36d5fd19db941ce765912a0dbb533b5fe1eb4d48

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