Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa7d4030c83bafc…

MALICIOUS

PDF

45.1 KB Created: 2021-06-02 20:38:21 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: dde3a8acffbbf98f1133db66f57b1476 SHA-1: 1fbdcfbd60e2024c61d0420bd1bf4e3e29bdc414 SHA-256: 3fa7d4030c83bafc65510c2266f9ee101cd12d270df2eb1116870a41991bbb74
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.xyz/app/431946152/roblox-robux-hack-no-offers-game-hack PDF link annotation
    • http://ines.co.rs/images/freer-tiktok_GM835599320.pdfIn PDF document text
    • http://ines.co.rs/images/daily-coin-master-free_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-minecraft-account-and-password_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/claim-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/minecraft-pocket-edition-free-ios_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-get-robux-fast_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/can-you-give-me-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-game-hack-app_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-spins-and-coins-com_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-spins-link-in-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-minecraft-maps_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/free-minecraft-hacks_GM479516143.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-hack-version-ios_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/how-to-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-please_GM431946152.pdfIn PDF document text
    • http://ines.co.rs/images/coin-master-mod-apk-hack_GM406889139.pdfIn PDF document text
    • http://ines.co.rs/images/free-robux-no-verification-no-survey_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
font_00_sfnt_off00004e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4E0E 28444 bytes
SHA-256: d19d0eec31ebfec7ba6a2dbff19b46458e655caab512d5f179fb2b981a79ddb5
font_01_sfnt_off00008d71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D71 18320 bytes
SHA-256: 38101cc8e6fdd047df17d4954f05e84cbff38ccea7c91693a22f047df1aaecd5

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