Malicious PDF — malware analysis report

Static analysis result for SHA-256 6aa0681dcac85445…

MALICIOUS

PDF

51.6 KB Created: 2021-05-17 04:00:05 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2026-06-04
MD5: bf6acb2844efff9605815038600c64a0 SHA-1: 275eeb7b7198a562fe9ca0ee9f33b7df8ea2972c SHA-256: 6aa0681dcac8544501a1e9ec060bae60eabab13a423ae4a5f6abbc41d43ab482
200 Risk Score

Malware Insights

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

The PDF file contains multiple links to a redirector URL that impersonates Microsoft and offers a "free Robux" generator, a common lure for credential phishing or malware distribution. The ML classifier also flagged this PDF as malicious. While no scripts were explicitly extracted, the embedded URLs and the nature of the lure strongly suggest an attempt to trick the user into visiting a malicious site, likely leading to further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8646

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.xyz/app/431946152/free-robux-no-verification-2021-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.xyz/app/431946152/free-robux-no-verification-2021-game-hack In PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-robux-generator-com-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-hack-apk_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/how-can-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/get-roebucks-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/microsoft-roblox-rewards_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/get-free-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/spin-coin-master-free_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/games-on-roblox-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/minecraft-free-ios-2021_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/rbx-claim_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-free-spin-and-coin-link-haktuts-hacking-news_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/hacks-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/roblox-games-free_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/toolbox-for-minecraft-ios_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn4cirebon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-twitter_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004cf3.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CF3 28636 bytes
SHA-256: 50d1c6aeacb8ba2da1a3bccc730a097417ade4f5c56a699c0fb42a724570546f
font_01_sfnt_off00008d8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D8C 2928 bytes
SHA-256: d27ca7269cc665f7c566dcba71d1fcbd1348614b7b6242da2500f0713fcbc8bc
font_02_sfnt_off000097a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x97A6 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off0000a4b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA4B8 19004 bytes
SHA-256: d712ae43aec968503a6d4b8ef93db90b07e4d7d9799b66e9787cf09d99ae12e2

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