Malicious PDF — malware analysis report

Static analysis result for SHA-256 f81922c22fd2fb1e…

MALICIOUS

PDF

34.8 KB Created: 2021-06-28 12:41:01 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: b72bd870ac9620b9a4a3a804a0f03903 SHA-1: 6d38dce335edafd96d79fa0f4d2d8125cf3ced8c SHA-256: f81922c22fd2fb1ef1be558615cd1ae78fce9c93d57f284f842dde709b30faa3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains multiple links, including one to a known malicious redirector infrastructure at http://netcdn.co/app/431946152/how-to-instal-roblox-hack-game-hack. The document body and heuristics indicate a lure for game hacks, likely leading to further malware or phishing. No scripts were extracted, but the embedded URLs and redirector activity are strong indicators of malicious intent.

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.co/app/431946152/how-to-instal-roblox-hack-game-hack In PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-hacks-2021_GM406889139.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-script-hack_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/blox-fish-free-robux_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/pubg-uc-add_GM1330123889.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-links-no-human-verification_GM406889139.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/vortexx-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-executor-free_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-mm2-free-knife-codes_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-surveys_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/robux-free-2021_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-coin-coin-master_GM406889139.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/minecraft-free-install_GM479516143.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-robux-only-username_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-for-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/robux-scam_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/make-robux_GM431946152.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/coin-master-free-spin-codes_GM406889139.pdfIn PDF document text
    • https://setda.denpasarkota.go.id/new/public/ckfinder/userfiles/files/roblox-hacks-that-work-for-robux_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_off000031e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x31E1 22364 bytes
SHA-256: 7340458e1199bd80e4baffb99f13a0ee35f3496080a36039c24aa9779bbc7374
font_01_sfnt_off0000634f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x634F 18924 bytes
SHA-256: fccd210f8e5f73c6419921cef28f765107a9ba1a077344658eb6b786a4c3ece6

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