Malicious PDF — malware analysis report

Static analysis result for SHA-256 d43ef4327b4a7639…

MALICIOUS

PDF

43.3 KB Created: 2021-05-11 06:01:36 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 79d39d776e1304d2a4ed930086fa61f1 SHA-1: 77008ea062cc4f3ae2c8fedaba7d427e50823015 SHA-256: d43ef4327b4a7639c26a86a5956bf78dfa8a7317d6f085633a1aacdec45c9aa1
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to malicious infrastructure, specifically promoting a 'free Robux' generator hack. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the PDF's structure and embedded URLs are indicative of a phishing or scam lure designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9969

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/431946152/free-robux-with-no-survey-game-hack In PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-meme_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-hack-2021_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-35-2-hack_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-spins-coin-master-october-13-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-thumbnail_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-robux-survey_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-free-download-mac-full-version-2021_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-hack-without-verify_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/coin-master-time-hack-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/how-to-get-free-faces-on-roblox_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-coins-free_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/minecraft-hacks-18-9_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/robux-online_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/roblox-com-hack_GM431946152.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/como-hackear-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/free-minecraft-mods_GM479516143.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/master-coin-free-spin_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/hack-coin-master-ios_GM406889139.pdfIn PDF document text
    • http://perpus.unpam.ac.id/repository/ww-robux_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_off00004836.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4836 26028 bytes
SHA-256: 4a607e73812044f5720a48e48f5f1c7895dc5609376f1dd81375776890e65853
font_01_sfnt_off000084e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x84E6 18896 bytes
SHA-256: c9a06fd84da7c680e9235c6c693ba85d62e2f793adf65e6d39442d95d7fb6fc9

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