Malicious PDF — malware analysis report

Static analysis result for SHA-256 820a27ca7e7ea229…

MALICIOUS

PDF

34.8 KB Created: 2021-06-25 13:39:46 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 583cb4b155a0ef0dc80227a5561bab63 SHA-1: 22353f6850c48de19ff120fb36a371e097ecdfb3 SHA-256: 820a27ca7e7ea229231e444c83aabc5fe9c8f936da8a3b8c0fce39df5f80bc43
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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/www.free-face-on-roblox.com-game-hack PDF link annotation
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/how-to-get-800-robux-for-free_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/how-to-get-free-spins-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/2021-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/how-to-o-get-free-coin-master-spins_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/hack-coin-master-android-2021_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-hack-apk-download-for-android_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-roblox-outfits_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/free-the-alchemist-codes-roblox_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/roblox-a_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/roblox-free-builder-club-hack_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/roblox-guess-the-song-cheat_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/roblox-online-free-no-download_GM431946152.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/daily-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://www.elearning-ganjil.massimbangkulon.sch.id/__statics/gudangsoal/files/tiktok-free-100-likes_GM835599320.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_off000031c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31C7 22040 bytes
SHA-256: 7fe76db017f65a930c7363932fbb021b1ac47b516bcaac920acca63b5ef2c5ef
font_01_sfnt_off0000620e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x620E 19340 bytes
SHA-256: 9eb6a71d7cc2764abc68c2ba6c0bf50938762681c87837bc22e690bb17faad61

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