Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b95fe2b3344dfc7…

MALICIOUS

PDF

45.1 KB Created: 2021-05-18 04:33:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 85f549400979e19ed493584c988653d0 SHA-1: 977f4423a4f916703bcf1a55016ac35c56b45aa5 SHA-256: 4b95fe2b3344dfc7a51ba73237f16092a36777967505527517ce59de9def0174
182 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document employs a lure of free game currency and hacks, impersonating brands like Netflix to entice users. It contains numerous external links, including a primary redirector and a large farm of other PDF files, suggesting a tactic to manipulate search engine results and drive traffic. The ML classifier strongly indicated maliciousness, and the overall structure points to a campaign focused on user engagement with potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/free-money-and-spins-coin-master-game-hack.
  • 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/free-money-and-spins-coin-master-game-hack PDF link annotation
    • https://consorziocsa-asicaivano.it/images/mcpe-hacks_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/minecraft-java-edition-free-download_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/coin-master-spin-hack-app_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-hack-coin-master-game-2021_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-change-your-name-on-roblox-for-free_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/free-spins-coin-master-2021-today_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-get-more-free-coins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/bloxland-earn-free-robux_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/extra-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-download-minecraft-for-free-on-android_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/minecraft-112-2-hacked-client_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-get-free-coins-in-minecraft_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/free-robux-codes-2021-not-used_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/how-to-get-free-roblox_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://consorziocsa-asicaivano.it/images/coin-master-time-hack-2021_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_003_off00004f30.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F30 25956 bytes
SHA-256: 61aece684870a674a4da54bdcc390a8a5efa9d1cd56f5a96224e6801418e0378
font_01_sfnt_off00008b69.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8B69 19212 bytes
SHA-256: 03bccce1d34cd18261642d67affb1f7fafdfcd64c441002f5d00872f204a4bda

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