Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f69758057901c73…

MALICIOUS

PDF

44.5 KB Created: 2021-05-15 14:07:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7431f8e94a20e8f1fe19c929c24d2f25 SHA-1: 19f517508baea5f7e6bc428cdce2dae403313e40 SHA-256: 8f69758057901c73453c6c07e7f5cb30d20900bb9cdaf9c4afd64e60550f5ee4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, a common tactic for SEO spam or directing users to potentially malicious sites. The ML classifier strongly indicated maliciousness, and the presence of embedded URIs suggests an attempt to redirect users. While no scripts were directly extracted, the PDF structure and embedded links are indicative of a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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/431946152/free-roblox-accounts-2021-with-robux-game-hack PDF link annotation
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/hack-to-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-chromebook_GM479516143.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/how-to-make-a-minecraft-pe-server-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-client-download_GM479516143.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-heaven-free-spins-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-that-work-2021_GM431946152.pdfIn PDF document text
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/daily-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/minecraft-realms-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/free-magical-chest-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-and-coins-without-human-verification_GM406889139.pdfIn PDF document text
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/microsoft-bing-robux_GM431946152.pdfIn PDF document text
    • http://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/hack-de-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/what-is-a-minecraft-client_GM479516143.pdfIn PDF document text
    • https://elearning.mtsddikanang.sch.id/__statics/gudangsoal/files/coin-master-70-spin-link_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_003_off000049de.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49DE 27656 bytes
SHA-256: 55c7377611cf1681e6d461f91714656c37469fba602d5b14a58d7b009aae7c98
font_01_sfnt_off0000892f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x892F 19076 bytes
SHA-256: a3899638bf51e335cbc40673d1471e0832e9a39f88469ef4ed0809ba61e6f618

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