Malicious PDF — malware analysis report

Static analysis result for SHA-256 c720a60ea192b0d4…

MALICIOUS

PDF

50.0 KB Created: 2021-06-09 07:02:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 911dda9d0cf0207b0aaf801677c2c602 SHA-1: 71b7e351a0162efba1c482c5ffd50ff0c474f6a0 SHA-256: c720a60ea192b0d43380244c21f7d6f8a17e9bd2229139667446f3fa49bf5c4b
102 Risk Score

Malware Insights

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

The PDF document contains a lure for free Robux, directing users to an external URL. It also hosts a large farm of 28 external PDF links, many of which are related to game cheats or hacks, suggesting a link farm or redirection scheme. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/free-robux-no-human-verification-or-survey-no-email-game-hack
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-time-hack_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/minecraft-xbox-one-code-free_GM479516143.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/roblox-toy-codes-free_GM431946152.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-spin-sites-for-coin-master_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-free-link-facebook_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-spins-on-coin-master-app_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/minecraft-java-account-free_GM479516143.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-coins-and-spins-coin-master-2021_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-free-spins-2021-ios_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/how-to-get-free-likes-and-followers-on-tiktok_GM835599320.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/blox-supply-free-robux_GM431946152.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-online-spins-coin-master_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-robux-codes-2021-not-used_GM431946152.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/apps-to-get-minecraft-for-free_GM479516143.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-2021_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/pokemon-go-free-account-username-and-password_GM1094591345.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-pet-food-coin-master_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/how-to-get-roebucks-in-roblox_GM431946152.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/coin-master-hack-mod-apk-35-8_GM406889139.pdf
    • https://maniclampungtimur.sch.id/__statics/gudangsoal/files/free-robux-codes-no-verification-2021_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000500d.bin
59a64609843d1b85d5b89f19a3f0ee45007241f8d072bdb29233cc8419d36c4c		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x500D 28640 bytes
font_01_sfnt_off00009129.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9129 5696 bytes
font_02_sfnt_off00009e3b.bin
53fe55dea7c622dc959f89174d9727e3b5ac2478c657318317f3152128db7f19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E3B 19228 bytes

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