Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dea5a91c9aedc26…

MALICIOUS

PDF

41.1 KB Created: 2021-05-11 20:40:34 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 1fc7ff85f8601265712c91b539183823 SHA-1: 08340a01b65798e10091be54db3c2bd5bab4d016 SHA-256: 4dea5a91c9aedc263c6591c2b6cbea7dda072b5eaf2a1f893d9152ede05641f3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple embedded URLs that redirect to malicious infrastructure, specifically promoting 'free generators' and 'game hacks' for Coin Master. The ML classifier strongly indicated maliciousness, and the presence of redirector links confirms a malicious workflow. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to lure users to potentially malicious websites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • 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.
  • 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/406889139/coin-master-hacks-that-work-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-apps_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/make-free-robux_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-no-survey_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/rbx-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-links-that-don-t-expire_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-today-instagram_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-card-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-exchange-40-free-spins_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-master-spins-without-human-verification_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/earn-rbx_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-real-working_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-exploits-for-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-no-verification-2021_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-date-and-time-hack_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-get-free-spins_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_off000047db.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x47DB 24084 bytes
SHA-256: 39fc525084af1590f9b2c4c1a221de72d85092b9926081b214c62f0a0fa6fb31
font_01_sfnt_off00007eb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7EB5 18080 bytes
SHA-256: a256473b464e1451fa8156fe2d40fad7cf096e7b0a57ca1e64cc78dc1e83e30f

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