Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b042b1f15f602b4…

MALICIOUS

PDF

35.0 KB Created: 2021-07-06 04:07:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-11-24
MD5: cb1f22c188fc49f2b26badc5e1a5106e SHA-1: af5a1f501a663809d2dfac7002715e444cb54c27 SHA-256: 5b042b1f15f602b4af10c35628d8c2d27931537368e9f2890303041bf0ad2d8f
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a redirector hosted on 'netcdn.tw', which is flagged as malicious infrastructure. The document body and heuristics indicate a lure for game hacks or free generators, specifically mentioning 'Coin Master' and 'Robux'. The presence of embedded URLs and the nature of the lure suggest an attempt to direct users to potentially harmful content or further malicious downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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 http://netcdn.tw/app/406889139/how-to-get-free-spins-on-coin-master-without-waiting-game-hack In PDF document text
    • https://perpustakaan.itda.ac.id/repository/omg-free-robuxnet16_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-hack-tools-download-2021_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-spin-coin-master-game_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/bux-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-hack-android-no-root_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-free-exploits_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-free-candy-van-exploit_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-spins-from-coin-master_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/games-in-roblox-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-spin-hack-2021_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robux-hack-no-download_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-no-verification-2021-pc_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/roblox-ftw_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/free-robux-geneorater_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/how-to-get-a-free-item-on-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/criminal-vs-swat-roblox-hacks_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/coin-master-hack-ios-download_GM406889139.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/doctor-louie-roblox_GM431946152.pdfIn PDF document text
    • https://perpustakaan.itda.ac.id/repository/easy-coin-master-hack_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_002_off00003122.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x3122 22824 bytes
SHA-256: bd077ca707a3f79c1182e9c6c0689bca437aeb85ad95e77e7ae9d173939437d6
font_01_sfnt_off00006460.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6460 18844 bytes
SHA-256: a302f9cb8c1074958355bec3e4e5afddea236ff693b23a31c105029b56aa9cbf

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