Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a856558cfbbbc6c…

MALICIOUS

PDF

44.9 KB Created: 2021-06-03 05:03:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d5fe4ce16ea9eb0358a78f58dfdf91c0 SHA-1: 7718a6125057ef64c193a45b4e5e128015cd2be7 SHA-256: 3a856558cfbbbc6c8ec6f4cdbbd40cfa1840a97d357014561e62c1eeb9cb2653
122 Risk Score

Malware Insights

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

The document impersonates Microsoft to lure users with promises of free game items, directing them to a malicious URL. The ML classifier strongly indicates maliciousness, and the presence of external URIs and brand impersonation heuristics support a phishing or malware distribution attack pattern. No scripts were extracted, but the document's structure and embedded links suggest it is designed to exploit user interest in popular games.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 5

  • 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.online/app/479516143/free-minecraft-java-edition-codes-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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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/free-minecraft-java-edition-codes-game-hack PDF link annotation
    • http://oca.undil.tl/repository/free-daily-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-cheat-engine-hack_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-free-gold-cards-in-coin-master_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-for-kids_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/minecraft-account-hacked_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-quiz_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-daily-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spin-and-coins-fbid-links_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-windows-10-for-free-with-java_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/robux-earner_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-hack-to-get-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/body-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-free-gamepasses-on-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-app-android-download_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-robux-now_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/tiktok-free-zong_GM835599320.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-xyz-download_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_off000051ce.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x51CE 26076 bytes
SHA-256: 2364202390902b39fbae2edbfb050fdc1f9d29362761c193324ca58c415532a5
font_01_sfnt_off00008d7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D7A 18164 bytes
SHA-256: 763f9cfe2ad76014aae7cafc6f7611f20a26af8eb80c124d2b15476bdad829f1

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