Malicious PDF — malware analysis report

Static analysis result for SHA-256 6efe66c0f4ecb3ee…

MALICIOUS

PDF

34.7 KB Created: 2021-07-09 04:15:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 0e24671f1efa6378b1283795ddb7c3d4 SHA-1: c470bc5485a3f37d2f94c656e45d54d39568e224 SHA-256: 6efe66c0f4ecb3ee5f7ed54d8ebc27aa293b05faf69eb1479905580438535af7
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 0.9980

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 http://netcdn.tw/app/406889139/free-coins-and-spins-coin-master-game-hack PDF link annotation
    • https://www.knjizara-harfa.rs/files/coin-master-spin-link-free_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-daily-free-spin-and-coin_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/hacks-for-adopt-me-roblox_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-kid-friendly-no-human-verification_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/roblox-mania-com-free-robux_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/best-gams-on-roblox-that-are-free_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-roblox-legit_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/download-coin-master-hack-mod-apk_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-32-mod-hack-apk-download_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/coin-master-fun-hack_GM406889139.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-roblox-accounts-walang-pin_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-online-free-no-download_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/how-to-get-a-free-minecraft-account_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-script-executor-roblox-2021_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/minecraft-free-app_GM479516143.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/robux-game_GM431946152.pdfIn PDF document text
    • https://www.knjizara-harfa.rs/files/free-coin-master-spins-hack_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_002_off00003227.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3227 22720 bytes
SHA-256: 741d15336f71833a4a03832c671ed8eadb9cbec57d6dd6b1e3f6d7c1d0acb910
font_01_sfnt_off000064b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x64B7 18348 bytes
SHA-256: c90f632020bcb1e728f62a43997badda2860e0d329262e99dedc1f8a12c39115

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