Malicious PDF — malware analysis report

Static analysis result for SHA-256 36a7c6a498df17c4…

MALICIOUS

PDF

44.6 KB Created: 2021-06-09 13:10:17 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ce932e1fe6108c70e12053be9389b7a0 SHA-1: 28a41b20cf772539607a3b430f1bb7159202f9bf SHA-256: 36a7c6a498df17c48b9c79a4ed9e04392700275aa56905bd95e4670ea6bfdaee
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive 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 0.9865

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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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/discord-for-roblox-swear-hack-game-hack PDF link annotation
    • https://library.itn.ac.id/perpusitn/repository/daily-free-spins-and-coins-coin-master_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hacks-and-cheats_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-robux-without-verification_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-free-spins-links-2021_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-hack-coin-master-pc_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/legit-coin-master-hack-site-zyngaplayerforumscom_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/juego-hackeado-de-coin-master_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-password-hacker_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-do-you-get-free-roebucks_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/comapp-trekfree-coin-spindaily-link-master_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-inappropriate_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/noclipper-hacks-roblox_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/coin-master-hack-mod_GM406889139.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/hacks-minecraft_GM479516143.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-do-i-get-free-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/roblox-earn-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/get-me-robux_GM431946152.pdfIn PDF document text
    • https://library.itn.ac.id/perpusitn/repository/how-to-get-free-robux-without-verifying_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_off0000517b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x517B 24800 bytes
SHA-256: c25238082d07d398b6f0cf31b16eccc4d2d157ee48d716f838e2f112d7020d46
font_01_sfnt_off000089d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x89D3 18972 bytes
SHA-256: 4675bad687cacef2636b561b37910134baf449905de9b7f5217e55f1b98ebf13

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