Malicious PDF — malware analysis report

Static analysis result for SHA-256 5436508cf58df276…

MALICIOUS

PDF

45.5 KB Created: 2021-05-12 05:34:45 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 8473e39974903fbcbead52dad8623675 SHA-1: 0abe1086b16a5d395c04c94310e408e053a57bf9 SHA-256: 5436508cf58df2764edbfe24579052b0b8159ac804fd62c04bf7912ad0a70658
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple external links, including one to a 'free generator / game hack' lure and a large number of links to other PDFs hosted on a subdomain. This suggests a link farm or SEO manipulation tactic to drive traffic to potentially malicious content. The ML classifier also strongly flagged this PDF as malicious.

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.
  • 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.
  • 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.xyz/app/431946152/free-private-server-roblox-game-hack PDF link annotation
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-blogspot_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/minecraft-ps3-free-download_GM479516143.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/free-2021-robux_GM431946152.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/como-hackear-juego-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/clients-minecraft_GM479516143.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/real-hack-for-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/how-to-create-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/free-links-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/roblox-rape-hack_GM431946152.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/how-to-hack-coins-in-mcpe-master_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/free-coin-spin-daily-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/minecraft-windows-10-code-free_GM479516143.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-on-mobile_GM431946152.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/roblox-avatar-editor-free_GM431946152.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://elearning.manposo.sch.id/__statics/gudangsoal/files/free-robux-generator-2021-no-human-verification-or-survey_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004bfc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4BFC 29040 bytes
SHA-256: 11c9f79e60fc704c68274896202c1f4e9145ad42575bc46bf5ea1e0e80f5b79f
font_01_sfnt_off00008e7b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8E7B 18668 bytes
SHA-256: 0c1ebf4725aa76ec92a53ac4eb5ef555557a7fe73d781563fc2c7a2c487d54c6

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