Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b3a39455ecd5571…

MALICIOUS

PDF

50.1 KB Created: 2021-06-10 17:50:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e0e8af9bf5235366dddf0979f7e74672 SHA-1: c4a9c743d14e8bf199a4f803b192bdb9ebc311c1 SHA-256: 3b3a39455ecd5571c6b9b5a9f4a0451348e5060c8d70496fe9b8f07e3e22571d
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document contains multiple links that redirect to known malicious infrastructure, specifically promoting 'game hacks' and 'free generators' to lure users. The document body and embedded URLs suggest a phishing or scam attempt, likely to lead users to download further malicious content or compromise their accounts. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9789

Heuristics 4

  • 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.
  • 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/cheat-for-roblox-with-cheat-engine-game-hack In PDF document text
    • https://key8013805.com.tw/upload/files/free-account-roblox-with-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-private-minecraft-server_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-earn-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-free-spins-on-coin-master-without-waiting_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-hack-app_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-items_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/coin-master-gold-cards-hack-2021_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/give-me-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-coins-coin-master-link_GM406889139.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/no-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/kazok-robux-hack_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-windows-10-free_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/minecraft-diamond-finder-hack_GM479516143.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/how-to-get-free-unlimited-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-obby_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/roblox-robux_GM431946152.pdfIn PDF document text
    • https://key8013805.com.tw/upload/files/free-robux-no-survey_GM431946152.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_off00005204.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5204 28996 bytes
SHA-256: b95893ea485026cb19a70b40158e73efd56f778999aeb68af2045143ebf2f2ca
font_01_sfnt_off00009532.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9532 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00009f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9F1D 19052 bytes
SHA-256: 379edd18e0b41e746d9ec6e1921cf9a2b19ba061966c0022ea855d275353b658

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