Malicious PDF — malware analysis report

Static analysis result for SHA-256 211bbe05fa4b8adc…

MALICIOUS

PDF

46.8 KB Created: 2021-05-19 22:02:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: a5db837481476f033522d6aff51b1f26 SHA-1: 48890b4bc0b959ef526d5d158c4b4207339b02f1 SHA-256: 211bbe05fa4b8adc57d499e38e7fd269cef171dd2d8a12bba7500a1557df5b8e
142 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating a malicious social engineering lure, specifically a browser extension/update installation scam. It also contains numerous embedded URLs pointing to external resources, including one that appears to be a direct download link. The presence of these elements suggests the document is designed to trick the user into executing malicious code or visiting malicious sites, likely as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8948

Heuristics 5

  • 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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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/835599320/tiktok-free-view-followers-app-game-hack
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/sites-to-get-free-robux_GM431946152.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/coin-master-free-spinv1-0apkpure-com-apk_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/free-gold-cards-coin-master_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/free-spins-coin-master-november-2021_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/coin-master-15-free-spin-link-today_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/daily-free-spins-for-coin-master_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/claimrbx-free-robux_GM431946152.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/minecraft-games-to-play-for-free_GM479516143.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/robux-generator-no-verification-2021_GM431946152.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/roblox-rape-hack_GM431946152.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/free-coin-master-links_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-without-downloading-any-apps_GM431946152.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021-download_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/hack-coin-master-spin-apk_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/how-to-minecraft-for-free_GM479516143.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/robux-no-human-verification_GM431946152.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/pro-free-spins-coin-master_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/free-coins-coin-master-link_GM406889139.pdf
    • https://elearning.mtsn2kukar.sch.id/__statics/gudangsoal/files/roblox-com-free-play_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off000049ab.bin
443673ac7ce3019bc0247b312ee250eac633e4af6539a7eae1e49bbf13865250		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49AB 29216 bytes
font_01_sfnt_off00008b3c.bin
10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8B3C 2880 bytes
font_02_sfnt_off00009527.bin
1d6605940b1891a90b80e591e929276b30f31efa983d208d2459bde7dc86350b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9527 18004 bytes

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