Malicious PDF — malware analysis report

Static analysis result for SHA-256 08b51bbda3a5f030…

MALICIOUS

PDF

45.2 KB Created: 2021-06-09 03:52:24 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ccb64ed17aaa9bdcd98eacb50e39be6d SHA-1: 5bd886bde43679ed655e8a26c750471335dc2da1 SHA-256: 08b51bbda3a5f0303bfdd509c52dee7ec45395c930cfd6d8b91f825d23423478
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to pages offering game cheats and hacks. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs and the document body content suggest a lure to download potentially harmful files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.tw/app/431946152/4chan-roblox-hack-game-hack
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-without-human-verification-2021_GM431946152.pdf
    • https://katalog.smkn1glagah.sch.id//repository/free-account-roblox-with-robux_GM431946152.pdf
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-2021_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spin-today-2021_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id//repository/free-promo-codes-for-coin-master_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-hack-uk_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id/repository/minecraft-noob-vs-pro-vs-hacker-vs-god_GM479516143.pdf
    • https://katalog.smkn1glagah.sch.id//repository/how-to-get-free-robux-2021-easy_GM431946152.pdf
    • https://katalog.smkn1glagah.sch.id/repository/free-robux-no-human-verification-or-email_GM431946152.pdf
    • https://katalog.smkn1glagah.sch.id//repository/roblox-2021-hack_GM431946152.pdf
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-for-ipad-free_GM479516143.pdf
    • https://katalog.smkn1glagah.sch.id/repository/roblox-prison-life-hack_GM431946152.pdf
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-minecraft-for-free-on-android_GM479516143.pdf
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-spin-blogspot_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id//repository/free-minecraft-games-for-kids_GM479516143.pdf
    • https://katalog.smkn1glagah.sch.id/repository/get-free-spins-from-coin-master_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id//repository/guide--coin-master-free-tips_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id/repository/how-to-gain-more-spins-on-coin-master-for-free_GM406889139.pdf
    • https://katalog.smkn1glagah.sch.id/repository/cool-minecraft-hacks_GM479516143.pdf
    • https://katalog.smkn1glagah.sch.id//repository/roblox-assassin_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000054b1.bin
f31d5d7a0fb9dbdf2c5eee490f5384e87c10f9de0b1116fed298ce578808fe43
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x54B1 24744 bytes
font_01_sfnt_off00008dab.bin
057f57b36e0053f6b24041c4e1516b2e51864c93ee07850f67def0372d04b796
pdf-font-stream PDF embedded font (sfnt) at offset 0x8DAB 18412 bytes