Malicious PDF — malware analysis report

Static analysis result for SHA-256 645559ca611c64e2…

MALICIOUS

PDF

45.5 KB Created: 2021-05-16 00:05:27 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: e4ce884bcb8f9729015fc58cf9d321dd SHA-1: c3096216f53b19bf5d2b8febe4168fbcb8f131cc SHA-256: 645559ca611c64e2545be71c9f606ab9f1f8968744c879e08457d2101c361c4e
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded links and a link farm, directing users to external sites that promise game hacks and cheats. The ML classifier strongly indicated maliciousness, and the presence of multiple SEO-optimized PDF links suggests a coordinated effort to drive traffic to potentially malicious or scam-related content. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.xyz/app/406889139/coin-master-spins-hack-2021-game-hack PDF link annotation
    • http://www.nfca.org.tw/upload/files/free-robux-generator-no-survey-no-download-no-human-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/hack-coin-master-spin_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spin-coin-master-today_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/bux-gg-robux-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/actual-free-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-no-verification-no-survey_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-buy-robux-for-free_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-robux-on-phone_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-do-i-get-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-free-coin-and-spin-app_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/minecraft-for-ipad-free_GM479516143.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/coin-master-hack-apk-with-fb-login_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-to-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/how-can-i-get-robux_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://www.nfca.org.tw/upload/files/game-hunters-coin-master_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_003_off00004c13.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4C13 24920 bytes
SHA-256: 38e3df487aff76f96bd089e4f24b50e1fbc2bc433902605cc6c7ec17473c9d48
font_01_sfnt_off00008556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8556 2896 bytes
SHA-256: c1a618813a64314343402b2ec738fc11c4c912460a4c7ae3029924d2f9a229cd
font_02_sfnt_off00008f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F3C 18296 bytes
SHA-256: eaa60ab3b9dbdc46d7aef4d77b4227c1d0aeb4180c3635ae77be6ae4ebf58c24

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