Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ca5431838fac1cb…

MALICIOUS

PDF

48.4 KB Created: 2021-06-03 05:08:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 5e2ed2f4507646bed5728a8b11ec4b7e SHA-1: 04b69bd4afab0cdb3ed8b0be08bc4eaa1930756b SHA-256: 9ca5431838fac1cb045bc4f13e59e60a2b6779fda6fdad64da9f6d2e7230105d
200 Risk Score

Malware Insights

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

This PDF document employs a lure related to free Robux and game hacks, impersonating Microsoft to trick users. It contains multiple links to redirector infrastructure, including the primary malicious URL https://netcdn.online/app/431946152/free-robux-generator-2021-no-human-verification-game-hack. The presence of these links and the brand impersonation strongly suggest a credential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/431946152/free-robux-generator-2021-no-human-verification-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/431946152/free-robux-generator-2021-no-human-verification-game-hack In PDF document text
    • https://eyeonhimalaya.com/userfiles/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/where-tiktok-free-views-app_GM835599320.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/robux-link_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/roblox-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-daily-free-spins-haktuts_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-spins-promo-code_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/hack-a-game_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-hair-roblox-boy_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-free-spins-no-survey_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/minecraft-java-code-free_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/haktuts-coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-hack-roblox-accounts-for-robux_GM431946152.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/how-to-hack-minecraft_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/minecraft-free-education_GM479516143.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/tiktok-free-like-and-fans_GM835599320.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://eyeonhimalaya.com/userfiles/files/free-spins-coin-master-links-blogspot_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00005256.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5256 25468 bytes
SHA-256: 57413330d21904964998e13acf5349012e7381fd04ea6e57ee06a02a9c2f8622
font_01_sfnt_off00008d79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D79 2984 bytes
SHA-256: 889cfc2fd0afa9ea114d6666204c6ce0548d0aae2cba345827d317498c4c06bc
font_02_sfnt_off000097a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A5 19260 bytes
SHA-256: c7b90a5cfba5c375f14137d6940681acb1ecffd006539937a4c5badd529f0ccc

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