Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bf82825e1e06038…

MALICIOUS

PDF

47.6 KB Created: 2021-05-15 23:12:25 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 789e1dbd9028b4b25896b23635091099 SHA-1: 915b6448624c78b916812a82f6c6681d0acb5e2a SHA-256: 4bf82825e1e06038dc0409541ff3e9d04850835be3e72b35c28ae171caeffadb
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 0.9013

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/hack-coin-master-spin-android-game-hack PDF link annotation
    • https://dirigentigiustizia.it/images/coin-master-free-spin-realme-products_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/link-for-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-no-verification-required_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-100-free-spins-link_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-redeem-codes_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/collect-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/oprewards-free-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-download_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-hack-people-on-roblox_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-robux-no-anti-bot-verification_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/robux-hack-me_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/free-roblox-accounts-2021-with-robux_GM431946152.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/coin-master-hack-ios-app_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/how-to-legally-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/minecraft-pe-free-download-android_GM479516143.pdfIn PDF document text
    • https://dirigentigiustizia.it/images/moonactive-free-spins-link_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004fcc.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4FCC 27588 bytes
SHA-256: 0b4f8246690e0a7954e15edaeefc8e8f89f2adfc3477e035ef6de043557246cf
font_01_sfnt_off00008eb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8EB9 2812 bytes
SHA-256: fc92a80cefddbcc51cb4ecd7284aa73b746cbd66adcf1d96110f0323ec06b51f
font_02_sfnt_off0000985a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x985A 18068 bytes
SHA-256: 1ed1c134697499a64800fff091906e8fba4251740a5710e312219489406905e8

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