Malicious PDF — malware analysis report

Static analysis result for SHA-256 37b76fc4a5cc2b69…

MALICIOUS

PDF

34.3 KB Created: 2021-07-04 11:51:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 9d2974e371b91381a82b01b6f45603cc SHA-1: 951c12a7075bd6537835553049607e6bb0ae4253 SHA-256: 37b76fc4a5cc2b69e1b2f59250f6ceb2891abb5cfeb03e40299f9c93d435c7f1
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded links, many of which are SEO-optimized and point to sites offering free in-game currency or hacks. The primary URL http://netcdn.tw/app/406889139/coin-master-free-spin-and-coins-links-game-hack is likely a landing page for a phishing attempt or malware download. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests a malicious intent to drive traffic to potentially harmful sites.

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 http://netcdn.tw/app/406889139/coin-master-free-spin-and-coins-links-game-hack
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/assassin-roblox-free-exotic_GM431946152.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-android-device_GM479516143.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/minecraft-pe-017-0-apk-free-download-android_GM479516143.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coin-master-spins-link-download_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-april-12-2021_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-pet-food-hack_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/get-free-spins-coin-master-link_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-app_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-claim-spins_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-generator-free_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-hack-online-no-human-verification_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/coin-master-online-hack-generator_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/robux-free-gift-card-org-hack_GM431946152.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-roblox-followers-generator_GM431946152.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-coin-master-spin-app_GM406889139.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/websites-to-get-free-robux_GM431946152.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/free-roblox-outfits-2021_GM431946152.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/how-to-hack-into-someones-roblox-account_GM431946152.pdf
    • https://elearning.mtsn1bkt.sch.id/__statics/gudangsoal/files/is-coin-master-hacks-safe_GM406889139.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00003116.bin
86b1b2887e8098462dbe2b5be5455843228282ca19711843a564fb91e1ea0fd4		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3116 22272 bytes
font_01_sfnt_off000062bc.bin
d69a0a2edd95f9e38b96bcbf992a69ddda142703a71f9cfee81eaec1a075863f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x62BC 18520 bytes

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