Malicious PDF — malware analysis report

Static analysis result for SHA-256 c27f161679c8c222…

MALICIOUS

PDF

33.6 KB Created: 2021-07-07 02:34:43 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: 347d833d303af82274d7ce78f1a81201 SHA-1: 02af2787d909b06e3103917b59087875e0292cdc SHA-256: c27f161679c8c2224c744ad413f45646f3353cf4251c8454746e44a37ddc041e
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs and a document body advertising free Robux and game hacks, indicating a phishing or scam attempt. The presence of a PDF URI heuristic firing and the ML classifier's high confidence score suggest malicious intent. The document likely aims to redirect users to malicious sites or trick them into downloading malware disguised as game cheats.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 5

  • 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.
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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/431946152/free-robux-hacker-us-game-hack
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-robux-without-human-verification-real_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-robux-apps-that-work_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-modded-minecraft-server-hosting_GM479516143.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-hack-free-spins_GM406889139.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-safe-roblox-exploits_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-free-spins-link-blogspot-today_GM406889139.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/roblox-imagine_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/roblox-hack-how-to-get-free-robux-2021_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master-2021-link_GM406889139.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/auto-clicker-free-roblox-shinobi-life_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/minecraft-free-android_GM479516143.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-free-gold-cards-link_GM406889139.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-stuff-on-game-on-roblox-2021_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-accounts-2021-using-cmd_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/jailbreak-hack-free-robux_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/how-to-hack-roblox_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-spin-coin-master-twitter_GM406889139.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-spins-and-coins-coin-master_GM406889139.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/free-robux-no-anti-bot-verification_GM431946152.pdf
    • https://elearning.mtsnkarawang.sch.id/__statics/gudangsoal/files/coin-master-hack-uk_GM406889139.pdf
    • https://elearning.mtsnkarawang.sch.id/__
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002f7a.bin
460dfa5270139c0c5d951a0a5f6b1f44162449620ad7ffc592ecf25cdf9808f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2F7A 21508 bytes
font_01_sfnt_off00005e8d.bin
bfc674629a4fdfc233a3c1a19cbee54387e60bd0cdfc4a3107778b42d9fa82d8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E8D 18884 bytes

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