Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad596ebef5277188…

MALICIOUS

PDF

35.2 KB Created: 2021-07-04 23:04:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 64fce3f57a9e2c4acb15f447bfe06971 SHA-1: c9063ff7b43fb403f1cd03c4fba9521d7e827008 SHA-256: ad596ebef5277188971c343f4c764175c9d3b187cef74bd6b6ae5010e4eb0ab8
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to a known malicious redirector infrastructure, disguised as game hacks and free item generators. The primary lure URL is http://netcdn.tw/app/406889139/free-spin-coin-master-online-game-hack, which is likely used to deliver a second-stage payload. The ML classifier strongly indicated maliciousness, and the presence of numerous embedded URLs further supports this assessment.

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/free-spin-coin-master-online-game-hack In PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-robux-in-robolx_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/how-can-i-get-free-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-roblox-hack_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/roblox-free-robux-hack_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-shrek-head-roblox_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/how-to-hack-in-arsenal_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/minecraft_GM479516143.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/vh2-roblox-hack_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-robux-without-doing-anything_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-knife-cbro-roblox_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/how-to-get-a-free-boombox-in-roblox_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-roblox-gams_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/free-robux-glitch_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/coin-master-redeem-code-free_GM406889139.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/roblox-earn_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/roblox-booga-booga-mojo-fly-hack_GM431946152.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/minecraft-hacks-list_GM479516143.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/minecraft-rtx-download-free_GM479516143.pdfIn PDF document text
    • https://gaushalango.com/uploaded_files/userfiles/files/get-any-roblox-items-for-free-with-inspect-element_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000344d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x344D 22696 bytes
SHA-256: 3948a1a024b11537605ef90915570904b1853b66dc02b7e023cd60ea28dcc74c
font_01_sfnt_off00006746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6746 18248 bytes
SHA-256: 718000fc3e7da0c31b23af4d5e60fd4d6a72eced0c4bcd142bf02af8ab821887

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