Malicious PDF — malware analysis report

Static analysis result for SHA-256 480baf20335408ba…

MALICIOUS

PDF

44.6 KB Created: 2021-06-08 12:01:22 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e26a921356e2abe1d472a7b5ff725b01 SHA-1: 15365b46628271b5c99543dda10bf549c256c0c9 SHA-256: 480baf20335408ba12c98d6ab54d3ae3270a888a71b09b66dae4f71d3f1a2ed9
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.tw/app/431946152/get-free-robux-game-game-hack PDF link annotation
    • http://pustaka.bbppketindan.info//repository/hack-coin-pro-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-download-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-software_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/get-roebucks-com_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pig-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/pubg-uc-new-freepik_GM1330123889.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-tool-access-online-generator_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/how-to-hack-a-minecraft-server_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/como-hackear-el-juego-coin-master_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-hack-game_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/coin-free-spin_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/spin-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/coin-master-daily-rewards-link_GM406889139.pdfIn PDF document text
    • http://pustaka.bbppketindan.info/repository/roblox-how-to-look-cool-for-free-2021_GM431946152.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/how-to-get-minecraft-pe-for-free_GM479516143.pdfIn PDF document text
    • http://pustaka.bbppketindan.info//repository/robux-miner_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_004_off00005228.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5228 24576 bytes
SHA-256: 77bc30da68d11bd820b3861f43c101bd7c534029ece0759a8cba520e95f9c004
font_01_sfnt_off00008ae5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8AE5 18608 bytes
SHA-256: b4234cf168d650b59fe03e87e5b1b871a4e88716a5d6a0c6ebf9a4575030ad3f

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