Malicious PDF — malware analysis report

Static analysis result for SHA-256 21ca8535ce52e45e…

MALICIOUS

PDF

45.5 KB Created: 2021-05-14 23:53:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 622b98c42cabe54884c388730877c676 SHA-1: 38ee5f3cfc3c36f9cfdb1b317c9b1501bd6f0eea SHA-256: 21ca8535ce52e45ef3865afd0f0aa88ec17c3d7887b2a8dec769f4ac5611c1f7
142 Risk Score

Malware Insights

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

The PDF contains numerous links that are part of a link farm, designed to attract users with lures for game hacks and free currency. The primary URL, https://netcdn.xyz/app/406889139/coin-master-free-spin-and-coins-fbid-links-game-hack, is identified as a redirector for such scams. The document's structure and content strongly suggest a phishing or scamming attempt to drive traffic to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9507

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/406889139/coin-master-free-spin-and-coins-fbid-links-game-hack PDF link annotation
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/microsoft-bing-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/can-i-get-minecraft-windows-10-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-hack-roblox-passwords_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/facebook-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/daily-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-clothing-on-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-game-hunters-club_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/plug-toolbox-for-minecraft-free-ios_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/how-to-get-minecraft-on-chromebook-for-free_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/roblox-but_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-minecraft-account-and-password-2021_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/free-roblox-clothes-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/coin-master-free-spin-software_GM406889139.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/promo-codes-for-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsn6nganjuk.sch.id/__statics/gudangsoal/files/robux-free-gift-card-org-hack_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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004d4b.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4D4B 24612 bytes
SHA-256: 0cfeeb3d5e1b750dcf70b0f8f8093d7c541c36138fe9a6bbcad5b5e1cb283214
font_01_sfnt_off0000852e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x852E 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off00008f19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F19 18388 bytes
SHA-256: 3cac3a67a18aefc9018cab5069c316f318df6e005a7bd0b6256086240f829048

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