Malicious PDF — malware analysis report

Static analysis result for SHA-256 52d7e39b99a060c7…

MALICIOUS

PDF

44.9 KB Created: 2021-06-04 01:38:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-23
MD5: c17bf121c3da54eabba01533036b976f SHA-1: 136b4b7b3fdbbcc3494ecdfd3b989b4c8cc04067 SHA-256: 52d7e39b99a060c74b6f00e327f095dc77d436f95719f7e078db490aab3f0c46
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'game hacks' and 'free generators'. The primary malicious URL identified is https://netcdn.online/app/431946152/robux-only-game-hack. The document body, though heavily obfuscated, contains references to this URL and appears to be a lure for users seeking in-game currency or cheats. No scripts were extracted, but the presence of malicious redirector links and the ML classifier's high confidence indicate a high likelihood of a phishing or scam attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

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.online/app/431946152/robux-only-game-hack In PDF document text
    • http://library.asih-husada.ac.id/repository/best-hack-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/robux-free-promo-codes_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/download-hacked-games-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-free-daily-spins_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/roblox-com-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-116-1-download_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/minecraft-hacks-115-2_GM479516143.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-hack-apk-app_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-spins-on-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-game-free-play-online_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/freecoins_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/coin-master-links-2021_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/apps-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/free-links-for-coin-master_GM406889139.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/is-there-a-way-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.asih-husada.ac.id/repository/can-you-actually-get-free-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_004_off00005072.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5072 26020 bytes
SHA-256: 57d555c8073a41490505fbb4328b41a5af8972cd0759483169caf2c191c591b7
font_01_sfnt_off00008d63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8D63 18104 bytes
SHA-256: 835647ca3f0bcc9c34df60568ac9a35acac0655e7da8ad66dbd525e7cff734af

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