Malicious PDF — malware analysis report

Static analysis result for SHA-256 17a836f9986b73e7…

MALICIOUS

PDF

42.1 KB Created: 2021-05-16 11:24:59 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 5a2523d0815ff0ab355cd1998b58723b SHA-1: e3c3e2b9ba47ea1c2b0657a0e155ab5300c8a20c SHA-256: 17a836f9986b73e73b8460a235b5748f368792eb6aeebee22c101a440f80178c
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/coin-master-game-android-free-download-game-hack PDF link annotation
    • https://kalendarite.eu/images/how-to-get-free-robux-as-a-kid_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-spins-link-2021-no-verification_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/how-to-get-100-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/how-do-u-hack-roblox_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/202100-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-get-free-cards_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/free-robux-images_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/robux-generators-that-actually-work_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-spin-coin-master-link-2021_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/how-to-get-minecraft-windows-10-for-free-2021_GM479516143.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-free-spins-link-2021-download_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/free-coin-spin-daily-link-net_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-invite-friends-free-spins_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/roblox-arsenal-hack-script-pastebin_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/how-to-get-free-outfits-on-roblox_GM431946152.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-hack-ios-jailbreak_GM406889139.pdfIn PDF document text
    • https://kalendarite.eu/images/coin-master-daily-free-spins-link-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_off0000497e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x497E 24628 bytes
SHA-256: 72e5d0e0a02b57514ac96866a2d5c5c6364ac2826a5f4eed741f9f52bd0eaa04
font_01_sfnt_off00008172.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8172 18548 bytes
SHA-256: 410bff1bf062602f617a153b189e58c0fc30012b031a4f5a53fb6347e35a049e

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