Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bb7a504e732b78f…

MALICIOUS

PDF

33.7 KB Created: 2021-06-26 08:55:39 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 789a9afd9ce9e7f30932915ccd8ace57 SHA-1: d835a6baa39370fdbff2b102af6d191406d3da77 SHA-256: 9bb7a504e732b78fa26835c3fb2314fa11f4b516a7ad32c83e0f7ad442f0b64d
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF document was flagged as malicious by an ML classifier. It uses a clipboard-command (paste-and-run) lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure 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 0.9824

Heuristics 6

  • 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.
  • PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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/roblox-how-to-get-free-animation-packs-game-hack PDF link annotation
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/free-robux-websites-that-work_GM431946152.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-builders-club_GM431946152.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/free-tiktok-likes-and-followers_GM835599320.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/how-to-log-out-of-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/minecraft-pocket-edition-download-free-pe-calculator_GM479516143.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/tiktok-free-bot_GM835599320.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/minecraft-linux-free_GM479516143.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/is-minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/minecraft-alt-accounts-free_GM479516143.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/free-old-roblox-accounts_GM431946152.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/coin-master-hack-no-survey-2021_GM406889139.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/coin-master-free-mighty-lion-card_GM406889139.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/is-minecraft-free-on-pc_GM479516143.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • https://elearning.diniyyahpasia.sch.id/__statics/gudangsoal/files/coin-master-free-rewards-link_GM406889139.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_off00002d29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2D29 21924 bytes
SHA-256: e780d976d72876c907a7799c174fb686397db264d12615808b90a6e973b1ad4a
font_01_sfnt_off00005d5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5D5E 19624 bytes
SHA-256: af424e5c706fb072048cbee960cc4456edbac6ddbe97b9ebc9e6b1895dfa243c

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