Malicious PDF — malware analysis report

Static analysis result for SHA-256 da97251d7b62e2ca…

MALICIOUS

PDF

35.0 KB Created: 2021-07-01 09:30:58 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: becfad174be5390592b52afec0014616 SHA-1: f0ad22dc9fe1489a403eb47ce26091425173b1e9 SHA-256: da97251d7b62e2ca31a94de89f974be050d6c4450723ec27f67bf3a74ff10ee3
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

The PDF document contains a large number of external links, many of which are related to game cheats and free currency for popular games like Roblox and Coin Master. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous SEO-style links suggests a link farm designed to attract users seeking exploits. The document body and extracted URLs indicate a lure for users to download or access potentially harmful content.

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.co/app/431946152/https-web-roblox-com-games-2021202187-free-join-now-game-hack PDF link annotation
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-and-coins-app_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-robux-without-downloading-anything_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-make-a-roblox-hack-script_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/hack-coin-master-download-ios_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-hacking-news_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-game-pack-coin-master_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spins-2021-generator_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-hack-robux-2021-on-ipad_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-get-free-hats-and-gear-on-roblox_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/free-robux-gift-card-codes-2021-not-used-england_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/roblox-hack_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/blogger-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/cheat-engine-gui-roblox_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/how-to-hack-roblox-accounts-with-edit-this-cookie_GM431946152.pdfIn PDF document text
    • https://anshingtek.com.tw/image/data/files/robux-free-no-human-verification-2021_GM431946152.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
font_00_sfnt_off00002f55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2F55 21784 bytes
SHA-256: 0981d847d827daf10a320096f5a40073bb93c4488ed8799371709a40326e3a38
font_01_sfnt_off00005f36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F36 20508 bytes
SHA-256: 8c6a2385baa5437251339f9197eace26d2cc223685738695d40702491804649d

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