Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0819df1ec1e7411…

MALICIOUS

PDF

34.5 KB Created: 2021-06-18 21:47:53 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 5b70fef09a2de92c034c0fef40163a4a SHA-1: d62b0ccf2fcbac99249cb372d0a4c5fc9cf9ca5f SHA-256: a0819df1ec1e7411e7eba34d0eab227729b3dc92e1dfa11d94559ad4f4b7eec4
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

The PDF document contains a large number of external links, many of which point to other PDF files, suggesting a link farm designed to distribute malicious content. The document body and extracted URLs indicate a lure related to game hacks and free in-game items, likely to trick users into downloading malware. The ML classifier strongly flagged this PDF as malicious.

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/how-to-access-the-studio-of-a-roblox-game-hack-game-hack PDF link annotation
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/how-to-hack-someones-roblox-account_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/how-to-get-roblox-premium-for-free_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-for-free-on-your-phone_GM479516143.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/minecraft-free-download-android_GM479516143.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/coin-master-hack-uk_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-app_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-robux-offers_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/pokemon-go-free-versus-pc_GM1094591345.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-spins-and-coins-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-robux-codes-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/roblox-inappropriate-games_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_off00002fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2FA5 21904 bytes
SHA-256: a05910c836c8b2fd875a89a460147a7f1f65b806ac94eeaaec6a666046a0024c
font_01_sfnt_off00005f9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9B 19784 bytes
SHA-256: 60cfc383139e31ab1071cebf55c4feb12a74ef4c504b585225eda1d6eacadf37

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