Malicious PDF — malware analysis report

Static analysis result for SHA-256 717902ed4b40f2f8…

MALICIOUS

PDF

43.8 KB Created: 2021-06-03 11:52:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 88040c768d06e56a93ca0d89aa033699 SHA-1: 7494f98e1bed32485afc138a42acac10cf511e07 SHA-256: 717902ed4b40f2f85e315c0aa51777fd6e5506dc668c09b98ff2298f52cc043d
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 0.9865

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/406889139/static-moonactive-game-hack PDF link annotation
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/cm-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/coin-master-free-spins-link-facebook_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/free-private-server-roblox_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/free-coin-master-hacks-no-verification-or-survey_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/oprewards-com-earn_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/how-to-get-free-robux-on-android_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/coin-master-daily-free-spins_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/minecraft-windows-10-edition-hacked-client_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/coin-master-daily-free-spins-link-2021_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/was-minecraft-ever-free_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/coin-master-links-for-today_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/free-robux-for-kids-no-verification_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/coin-master-gameplay_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/how-do-you-get-free-food-on-coin-master_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/pokemon-go-free-walk-ios_GM1094591345.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/minecraft-kill-aura_GM479516143.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id//repository/coin-master-cards-for-free_GM406889139.pdfIn PDF document text
    • http://www.perpustakaan.smansa-bdl.sch.id/repository/wurst-client-112-2_GM479516143.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_off00005227.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5227 24476 bytes
SHA-256: 5e1e8d93b999b28badf56f6209d275d25b39e282b2a2706c1d63822c27659850
font_01_sfnt_off00008a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A40 17660 bytes
SHA-256: 566e41496f2ce4db5bf6689ca7f7f854e6f85c22f14e9f322398956df4889350

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