Malicious PDF — malware analysis report

Static analysis result for SHA-256 be1d3a0b1bfb07d3…

MALICIOUS

PDF

44.6 KB Created: 2021-05-15 23:31:00 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9499fbb8ff8268ab04252d9d90641cb3 SHA-1: 3e00796725e5cfdbf4315b1b4b6e8d65f2089fe1 SHA-256: be1d3a0b1bfb07d3c706ed56ff29f5b1605c7a2f5f27dfebea1400b66b7c5089
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/free-roblox-accounts-with-robux-that-work-2021-game-hack PDF link annotation
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/como-hackear-coin-master-iphone_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-hack-coin-master-apple_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/the-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-hack-tool-v1-9-apk_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/toolbox-for-minecraft-pe-mod-apk_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/earn-free-robux-on-roblox_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-spins-coin-master-hack-2021_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-free-spin-whatsapp-group-link_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-hack-any-roblox-account_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/minecraft-on-computer-free_GM479516143.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-hack-into-someones-roblox-account_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/hack-coin-master-for-free_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/get-coin-master-free-spin_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/how-to-get-more-spins-on-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-free-spins-link-hack_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-pc-hack-tool_GM406889139.pdfIn PDF document text
    • http://pengolahan.perpus.wima.ac.id/repository/coin-master-hack-without-verification-2021_GM406889139.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_off00004a64.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A64 27696 bytes
SHA-256: aaf0b1a99728d22b56f37540bc7e29deddf6794bb6d7cdb42007ca32b0a039f5
font_01_sfnt_off000088c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x88C3 19476 bytes
SHA-256: 4c7cb67921980cc467a624d7be0aa4f8f19dcdcb8d4cb789adc94de6f70366aa

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