Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7e87b92991d2c7a…

MALICIOUS

PDF

36.3 KB Created: 2021-07-04 18:50:19 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b7b9095088019f7c2cff48804638178e SHA-1: 0b8b32d27ffbf791ca48474a45c43e9cf2603428 SHA-256: b7e87b92991d2c7ad22cfa4a1be799e1909766124f1bdd044bfaf670f99dba78
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to manipulate search engine results. The primary URL, http://netcdn.tw/app/406889139/free-spins-coin-master-daily-game-hack, suggests a lure for game-related cheats or hacks. While no scripts were explicitly extracted, the PDF structure and embedded links indicate a malicious intent to redirect users to 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.tw/app/406889139/free-spins-coin-master-daily-game-hack PDF link annotation
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/hack-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-hack-apk-pc-download_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-fe-music-gui-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-arcane-adventures-cheats_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-get-free-minecraft-skins_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-free-gold-cards-link_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-with-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-robux-on-iphone_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-or-download-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/robux-win_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/orewards-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/has-your-roblox-account-been-hacked_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/robuxglobalcom-no-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/20210-free-spin-links-for-coin-master_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_002_off00003696.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3696 23052 bytes
SHA-256: 10cc01907ea807cfb243aaba72bfec93380d3ebef926cb59e8c58c7fceb400bf
font_01_sfnt_off00006a99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6A99 18596 bytes
SHA-256: 5411b9dbca58f16f8af8c21ebe49ba809f0efece3103b9aa7bb9d97b6685b20b

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