Malicious PDF — malware analysis report

Static analysis result for SHA-256 24dc8f8e66c36484…

MALICIOUS

PDF

48.2 KB Created: 2021-06-03 12:04:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 53edc6feb7049f380f1a820e764b40f1 SHA-1: 34c4234f5e28cebc6102cf7cf8835cafd34995a4 SHA-256: 24dc8f8e66c36484459d9744f3008b084385a8f18b074ed30b55ca5126b4a2df
142 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. 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 0.9871

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.online/app/431946152/roblox-hack-site-game-hack PDF link annotation
    • https://katalog.smkn1glagah.sch.id/repository/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/easy-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/roblox-no-download-hack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-70-spin-link_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/coin-master-heaven-free-daily-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/can-you-get-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/mosttechs-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/www-coin-master_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/minecraft-net-download-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/tower-of-hell-roblox-hack_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/can-you-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spin-and-coins-links_GM406889139.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id//repository/free-robux-gift-card-generator_GM431946152.pdfIn PDF document text
    • https://katalog.smkn1glagah.sch.id/repository/coin-master-free-spins-link-2021-app_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
stream_004_off0000537c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x537C 31248 bytes
SHA-256: f2042c9e8e7b4e5f46b2d3f3e5d670d50c0a10c3e159c78e65571cd43e6ce678
font_01_sfnt_off00009993.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9993 18408 bytes
SHA-256: baa68e8b80fe17984eb0f5893287011db8c451c65a8bba41303beeb2aadfa952

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