Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf8d202e4503b0e…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 13:06:35 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 51d7611a71453f0cdacc0ec2452dec02 SHA-1: 6a1ac539116e5daff0fa10b055b877e0f9fb8019 SHA-256: ecf8d202e4503b0e84e7a5d373eab2a546c617e18631f14c17d56cdeec463d22
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-twitter-game-hack PDF link annotation
    • http://e-mailservis.cz/images/get-2021-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/is-minecraft-education-edition-free_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/httpswwwurcouponsdealcom202103coinmasterfreespinandcoinlinkshtml_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-hack-coin-master-ios-no-jailbreak_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/how-to-get-free-robux-on-phone-2021_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-hacks-no-verification_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-coin-and-spin-for-coin-master_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/roblox-character-free_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/coin-master-guide-to-free-spins-and-rewards_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/get-me-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-roblox-gift-card_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-domain-for-minecraft-server_GM479516143.pdfIn PDF document text
    • http://e-mailservis.cz/images/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-roblox-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://e-mailservis.cz/images/free-spins-coins-coin-master_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004ae3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4AE3 24340 bytes
SHA-256: 3a83513e97d0c67a272ba166ac49b1627bd47ea5bc3a49b83efc1e5734ff8a3f
font_01_sfnt_off000081a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x81A4 17712 bytes
SHA-256: 338c422cc4b1338db2b603d539e5d6b05580e47693df7a8745f822589ab7623f

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