Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5a9cb4527ff2eb8…

MALICIOUS

PDF

46.0 KB Created: 2021-05-12 06:03:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: ac5fce102d7578e2d0657dae7b6412d3 SHA-1: b6ba95796246b438eb43c7e4214ce6a563e72cda SHA-256: a5a9cb4527ff2eb83df8d34c489388cf78cb10593ced4d6fdd1bc9d5cd3db5fb
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 https://netcdn.xyz/app/431946152/roblox-install-free-game-hack PDF link annotation
    • https://bancroftandsons.com/images/coin-master-free-spins-app_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/how-to-actually-get-free-robux_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-coin-and-spin-in-coin-master_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/how-to-hack-coin-master-game-ios_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-home_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-hack-game-download-ios_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/minecraft-com-free_GM479516143.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-robux-redeem-codes-2021_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/roblox-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-hack-tool-v1-9_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-viking-quest-hack_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-sound-daily-free-spins-link-today_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/free-robux-no-verify_GM431946152.pdfIn PDF document text
    • https://bancroftandsons.com/images/https-iosgodscom-topic-20218flipmastercoinshack_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/coin-master-ids-for-free-spins_GM406889139.pdfIn PDF document text
    • https://bancroftandsons.com/images/roblox-online-free-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_off00004b3d.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B3D 29072 bytes
SHA-256: f35f496d93730b619ea933556fa6592e4469924710e1d7a29e24e2dde0d165f7
font_01_sfnt_off00009175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9175 18280 bytes
SHA-256: 3c3a3b9ea50be1288d4e90d28d6823d5d0e7fce454efe1523ba787caa6fa0fc3

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