Malicious PDF — malware analysis report

Static analysis result for SHA-256 6419f62fb0badd4d…

MALICIOUS

PDF

44.0 KB Created: 2021-06-03 05:36:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 502bbeb2ebf9cd29eab9df9e04f418a9 SHA-1: 30ff4b4d97a2fefdb2ee7c9c75bd0987ebc7ccb6 SHA-256: 6419f62fb0badd4dc4cadc0c81399584689ef4153d10543c96a9ffeb14868e16
180 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a malformed stream and links to known malicious redirector infrastructure, specifically promoting a "free generator / game hack". The ML classifier also flagged this PDF with high confidence. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect the user to a malicious site, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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.online/app/406889139/free-gold-cards-for-coin-master-game-hack In PDF document text
    • https://opac.umrah.ac.id/repository/wurst-112_GM479516143.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-2021-free-spins_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-spins-link-today-blogspot_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-roblox-accounts-that-work_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-2021-spin-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/adopt-me-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/how-to-get-free-robux-generator_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-link-app_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-spins-coin-master-links-2021_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-coin-spin-coin-master_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-hack-app-link_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-free-cards_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-card-hack-apk_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-by-watching-ads_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/pokemon-go-free-vs-premium_GM1094591345.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/who-to-hack-pubg-uc_GM1330123889.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/coin-master-daily-free-spins-link-today-2021-free_GM406889139.pdfIn PDF document text
    • https://opac.umrah.ac.id/repository/www-coinmaster-com_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_004_off0000516f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x516F 24792 bytes
SHA-256: 70d62f59df793855ee8a019edd9bfe5e2fc2f4bd92215da75f98d70017ca3adf
font_01_sfnt_off00008a71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A71 17960 bytes
SHA-256: e7d6a33110c05f2f7358e31e331cf325c9b09bbae5ece44b659e3c4bfc76bc90

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