Malicious PDF — malware analysis report

Static analysis result for SHA-256 15947e789cdaa94b…

MALICIOUS

PDF

42.6 KB Created: 2021-05-17 13:11:28 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 82aadeb5846189d9260cc6535048ccd6 SHA-1: 05a6f88194c26aa4047347a12f74a477c96245d7 SHA-256: 15947e789cdaa94b55612f2d6f6f5cfcb8f628d468ea5bd8ed6a57cad1fa806d
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains multiple links designed to lure users with promises of game hacks and free currency, impersonating brands like Facebook. These links redirect to malicious infrastructure, indicating a phishing or credential harvesting attempt. The presence of embedded URLs and the ML classifier's high confidence score support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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/431946152/easy-robux-today-com-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
  • 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/easy-robux-today-com-game-hack In PDF document text
    • http://mbbs.hr/files/coin-master-free-400-spin-link_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/hack-coin-master-link_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-get-free-robux-games_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/2021-coin-master-hack-without-verification_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/lazyblocks-com-free-robux_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/legit-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-coins-coin-master-blog_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/minecraft-server-free-trial_GM479516143.pdfIn PDF document text
    • https://mbbs.hr/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/free-roblox-com_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/coin-master-free-spins-and-coins-2021_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/how-to-earn-free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://mbbs.hr/files/coin-master-free-spin-today_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-money-links-coin-master_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/free-robux-sites-that-work_GM431946152.pdfIn PDF document text
    • https://mbbs.hr/files/10-robux_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/is-minecraft-free-on-xbox-one_GM479516143.pdfIn PDF document text
    • http://mbbs.hr/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • http://mbbs.hr/files/is-free-robux-real_GM431946152.pdfIn PDF document text
    • http://mbbs.hr/files/roblox-hack-generator_GM431946152.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_off00004a4e.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4A4E 24524 bytes
SHA-256: 7624867dab7e81199407431cc9c2dc2370011988b0ec5d751126d91fa3f98846
font_01_sfnt_off0000829e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x829E 18692 bytes
SHA-256: 73d558874ba1f93a48afe8e813aec995f67c91820d85dfc512325dae3e965bb9

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