Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a89e621cbfcf5d4…

MALICIOUS

PDF

42.2 KB Created: 2021-05-14 19:02:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 51d93a3c4115e905680e3f01a307d9f7 SHA-1: 092e4d4517cdb0fa6da0f2318ff347721b7a9b2c SHA-256: 0a89e621cbfcf5d4b63e23348b7ba6928aa93bb1576118810f96043af702fc08
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 0.9971

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/free-spin-coin-master-today-game-hack PDF link annotation
    • http://emilac.com/images/free-minecraft-client_GM479516143.pdfIn PDF document text
    • http://emilac.com/images/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/roblox-promo-codes-free-robux_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/how-to-get-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/free-roblox-animations_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/hack-coin-master-free_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/how-to-get-free-robux-fast_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/coin-master-hack-2021-no-human-verification_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/free-coins-and-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/free-robux-no-verification-2021-android_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/free-minecraft-server_GM479516143.pdfIn PDF document text
    • http://emilac.com/images/roblox-person_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/free-mojang-account-with-minecraft_GM479516143.pdfIn PDF document text
    • http://emilac.com/images/minecraft-free-school_GM479516143.pdfIn PDF document text
    • http://emilac.com/images/pixies-gigantic-coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/cheat-codes-for-coin-master_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/coin-master-free-spins-link-download-free_GM406889139.pdfIn PDF document text
    • http://emilac.com/images/how-to-get-free-hats-on-roblox_GM431946152.pdfIn PDF document text
    • http://emilac.com/images/roblox-free-play-no-download_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_off00004a32.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A32 24504 bytes
SHA-256: 63d27e5bd664e97fe81cd5f8e50648652b7c18106ab82faa48d0e0feb797ae1d
font_01_sfnt_off00008299.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8299 18240 bytes
SHA-256: 75d5000e8f1c13244b223f0a61b12b9b535d128d76c8bd265699ae4a18287ba3

Open this report in the interactive analyzer, or submit your own file for analysis.