Malicious PDF — malware analysis report

Static analysis result for SHA-256 96f5d1b421b43ffa…

MALICIOUS

PDF

45.5 KB Created: 2021-06-11 10:13:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: b908eeafc653c86b766ac274ff6b7454 SHA-1: 5e53a8cba40c6ddad8b66da0d3502f24e6482a63 SHA-256: 96f5d1b421b43ffa9e56ea494e05111ca3fd327d96f3ccbff3d7d7858ec72b8b
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links to a known malicious redirector, disguised as game hacks and free generators. The primary link, 'https://netcdn.tw/app/431946152/cool-free-roblox-girls-hair-game-hack', is designed to lead users to download potentially harmful content. While no scripts were explicitly extracted, the nature of the links and the heuristic firings strongly suggest a social engineering tactic to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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.tw/app/431946152/cool-free-roblox-girls-hair-game-hack In PDF document text
    • http://library.stieyapan.ac.id//repository/easy-ways-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-coins-2021-coin-master-link_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-model-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/pubg-uc-gift-card-free_GM1330123889.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-cute-roblox-tops_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/coin-master-hack-2021-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/minecraft-free-download-mac_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/free-roblox-accounts-dantdm_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-free-spin-app-apk_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-com-roblox_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/mine-minecraft-games-for-free_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/coin-master-claim-spins_GM406889139.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/robuxlove-net-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/how-to-hack-to-get-free-robux-easy_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/mcpe-download_GM479516143.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/lin-for-free-robux_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-games-with-free-radio_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/roblox-robux-page_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id//repository/get-free-robux-no-verification_GM431946152.pdfIn PDF document text
    • http://library.stieyapan.ac.id/repository/free-robux-no-verification-at-all_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_off00005256.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5256 26880 bytes
SHA-256: 56ffa3ba0b70d8ae588979599ee5db06c6a446379fdbae1fe79015f51c0cfcf3
font_01_sfnt_off00008f34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8F34 18296 bytes
SHA-256: 1324aa8f27615dee022b0e9c314133c5abceb090696787a444a88d254d5f3b11

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