Malicious PDF — malware analysis report

Static analysis result for SHA-256 411a6d6642de0f6d…

MALICIOUS

PDF

43.3 KB Created: 2021-05-15 23:01:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 141b6bf9858a63756861f8b130be41e5 SHA-1: 9c4f0986faa26908448165a90f5cf33c3725ec65 SHA-256: 411a6d6642de0f6df8f7e8ca1bc697661f775a244c15d44164f8b086b9347b7f
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 0.9969

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-coins-link-2021-game-hack PDF link annotation
    • http://balitgetas.co.id/pustaka/repository/coin-master-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/op-rewards-robux_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-coins-and-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/how-do-you-get-free-pet-food-in-coin-master_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-spins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-robux-now_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/hack-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/robux-free-c_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-minecraft-generator_GM479516143.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-robux-games-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/coin-master-gold-cards-free_GM406889139.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-robux-gift-card_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/free-robux-website_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/how-you-get-free-robux_GM431946152.pdfIn PDF document text
    • http://balitgetas.co.id/pustaka/repository/how-to-get-free-robux-com_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
stream_003_off00004a53.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A53 29040 bytes
SHA-256: 94aac47a89a713b8c7a1acebc5c2440db089d7a6391319f8f9118c12aba3d681
font_01_sfnt_off000086d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x86D1 18284 bytes
SHA-256: be459003f2db1a934c49859962f2962ce704e042ee0985c73311b64c11e09449

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