Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a157cce03c0fc2d…

MALICIOUS

PDF

46.2 KB Created: 2021-06-08 22:04:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-26
MD5: b11e560699eec7a4fe563eb3c9cc6d39 SHA-1: ec10cc692bdae0d3a8b7928e28aafc489fb8d5a2 SHA-256: 4a157cce03c0fc2d1c1ea9704a80971a75477bce80c7e430a7f337d5f7b4b29e
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to redirector infrastructure, specifically promoting 'free generator' or 'game hack' lures. The document also contains instructions to disable security software, indicating a malicious intent to bypass defenses. The primary link identified is https://netcdn.tw/app/431946152/how-to-get-free-robux-from-slingtv-game-hack, which is likely the entry point to a malicious site or payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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.tw/app/431946152/how-to-get-free-robux-from-slingtv-game-hack In PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/daily-spins-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-codes_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coinmasterfreespinlink_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-spins-in-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/como-hack-coin-master_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/how-to-get-free-robux-gift-cards_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-unlimited-coin-master-400-spin-link_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-free-spins-and-coins_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-facebook-page_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-robux-no-verify-2021_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coin-master-ad_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/minecraft-free-download-laptop_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/free-spin-links-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/khaos-free-robux_GM431946152.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/can-i-download-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/pokemon-go-free-candy_GM1094591345.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/como-hackear-coin-master-2021-espaol_GM406889139.pdfIn PDF document text
    • http://opac.pps.uin-alauddin.ac.id/repository/coinmaster-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_004_off000055ba.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x55BA 25036 bytes
SHA-256: 15e95706bf8f53424b7acecf0b46c4405a94c5734f381a08db1cfb6a9ba7293f
font_01_sfnt_off00008f70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F70 19140 bytes
SHA-256: 1ebe700a54983099c25c36a41a93e6a2e003761a368b0ee9711956dcb7ca52d2

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