Malicious PDF — malware analysis report

Static analysis result for SHA-256 870e6f448332ef1e…

MALICIOUS

PDF

42.7 KB Created: 2021-05-13 03:31:03 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 64c911f4862970c0b840da8694108403 SHA-1: 92503fc2aa49b663bed63bd217b088d2c21acc17 SHA-256: 870e6f448332ef1eb8f875e99ebf37e81e84bcb6e3206f879b9d1ca7bdcedfbe
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains numerous links to external websites, many of which are designed as SEO link farms for game hacks and free currency. The primary lure appears to be related to 'Coin Master' and 'Robux' cheats. The document's structure and the high number of outbound links suggest it is part of a campaign to drive traffic to potentially malicious sites, likely for phishing or malware distribution. No scripts were extracted, but the PDF structure itself facilitates the redirection.

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/coin-master-cheats-2021-game-hack PDF link annotation
    • https://easypay.af/uploaded_files/userfiles/files/how-to-earn-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-hack-coin-master-computer_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-robux-without-verifying-2021_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/simplysarc_GM479516143.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-accounts_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-free-download-for-pc_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-hack-mod-apk-download_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/static-moonactive-net-free-spins_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-free-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-coins-and-spins-link-for-coin-master_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/free-roblox-templates_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-hacks-on-roblox_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/what-do-points-do-in-roblox_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/best-minecraft-hacks_GM479516143.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-to-get-free-robux-on-ipad_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/roblox40com-robux_GM431946152.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/coin-master-hack-android_GM406889139.pdfIn PDF document text
    • https://easypay.af/uploaded_files/userfiles/files/how-do-you-get-minecraft-for-free_GM479516143.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_off00004cbf.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CBF 25952 bytes
SHA-256: 3327372d729cabfea3cb13305ef6ef9f2af81c41823d08212dbe06767e18d35a
font_01_sfnt_off000084e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E7 18112 bytes
SHA-256: 8fd2be34c5ae6d36bafabdc0d90731bcc2dba590b40522d9b75e2e7b006908cc

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