Malicious PDF — malware analysis report

Static analysis result for SHA-256 c126f579ba566870…

MALICIOUS

PDF

42.1 KB Created: 2021-05-12 15:04:23 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 44b14b4874dc18c79c4f88ac200881d3 SHA-1: 5d1549a843029af4e7a0699ecea45017f426f307 SHA-256: c126f579ba56687045a6072c47130369c577be707fa91ab2ce872ac5f589e135
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains embedded links that lead to a known malicious redirector infrastructure, specifically promoting a 'game hack' lure. The document body and extracted URLs strongly suggest a phishing or scam attempt designed to trick users into visiting malicious sites. No scripts were extracted, but the presence of malicious links and the ML classifier's high confidence indicate a high likelihood of malicious intent.

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/hacks-for-coin-master-game-hack In PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/best-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-free-spins-link-download-apk_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/roblox-girl-avatar_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/hack-coin-master-game-apk-download_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/get-free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/free-spins-october-28-2021-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/withdraw-robux_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/100-free-spins-coin-master-link_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/roblox-builders-club-free_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/free-robux-2021-no-human-verification_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/free-100-robux_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/minecraft-free-apk-download-016-0_GM479516143.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/minecraft-free-version-pc_GM479516143.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/wurst-mc_GM479516143.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/roblox-adopt-me-free-pets_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-hack-2021-download_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/free-robux-no-email_GM431946152.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/safe-hack-for-coin-master-android_GM406889139.pdfIn PDF document text
    • http://opac.iainpekalongan.ac.id/opac/repository/coin-master-daily-free-spins_GM406889139.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_off00004b5c.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4B5C 24588 bytes
SHA-256: 9f4590fcb84951281bd5c7f1172cd2c99533a476a8f47a341fd3756d4d5034b8
font_01_sfnt_off0000837d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x837D 17880 bytes
SHA-256: aa3394458939619806496cbc198b043db21b7abc6a7e758b364f4c9fc0519879

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