Malicious PDF — malware analysis report

Static analysis result for SHA-256 977517b8632e0b19…

MALICIOUS

PDF

41.6 KB Created: 2021-05-16 15:12:33 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e689313417cbada94449e9a4f38a7f76 SHA-1: 49d2ae90b5d71e04902973ab2019fb654be4509c SHA-256: 977517b8632e0b1907f198fe20edbfec9586f3639af98694d7ae33e0d50a8f26
182 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses brand-impersonation credential phishing. 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 6

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/406889139/coin-master-daily-free-spins-and-coins-game-hack.
  • 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-daily-free-spins-and-coins-game-hack PDF link annotation
    • http://jdlrealty.ca/images/get-free-robux-now_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/free-robux-with-no-verification_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/roblox-zone-free-robux_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/bit-ly-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/apps-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/free-robux-generator-no-verification-2021_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/free-coins-on-coin-master-generator_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/minecraft-hack-download_GM479516143.pdfIn PDF document text
    • http://jdlrealty.ca/images/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/how-to-get-more-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/coin-master-mod_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/coin-master-free-spins-link-2021-ios_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/roblox-generator_GM431946152.pdfIn PDF document text
    • http://jdlrealty.ca/images/coin-master-hack-no-survey_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/how-to-get-free-coins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/free-spins-on-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://jdlrealty.ca/images/free-coin-master-spin-app_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
stream_003_off0000461e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x461E 25268 bytes
SHA-256: 7811bbfbaa74421b6e84bd73ae62e7e32201079f3c69d85e412e6101bde872f1
font_01_sfnt_off00007f97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7F97 18480 bytes
SHA-256: 323fea871d3154f9ddf991b22fd859b77165b4ee4e2d03de0fe4666202988bbb

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