Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca4779974bcd2a0a…

MALICIOUS

PDF

44.7 KB Created: 2021-06-08 14:54:14 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: a147ed81d7883b430b0d6e5146fb03cc SHA-1: 6d0f67078eb7e69eb55a3d799b79252e0f862327 SHA-256: ca4779974bcd2a0a74454a79fbccf3238e4e53e046dbd4ca787e83ed37bdfdb3
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded links, including a critical redirector link to 'https://netcdn.tw/app/431946152/0.1-know-this-free-robux-secret-game-hack', which is flagged as malicious. The document body and heuristics indicate a lure for free Robux or game hacks, a common tactic for phishing or malware distribution. The presence of a large number of external PDF links suggests a link farm designed to attract traffic and potentially distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/431946152/0.1-know-this-free-robux-secret-game-hack In PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/roblox-sign-in-free_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/how-do-you-get-free-robux-without-paying_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/coin-master-hack-pc-free_GM406889139.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/pubg-uc-nepal_GM1330123889.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/coin-master-hack-apk-no-fb-login_GM406889139.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/free-robux-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/roblox-hacked-version-download_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/fighting-free-card-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/minecraft-pe-free-download-ios-no-jailbreak_GM479516143.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/free-robux-codes-no-human-verification_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/roblox-18_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/pokemon-go-free-pokeballs-code_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/free-minecraft-bedrock-server-hosting_GM479516143.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/roblox-sexually-abused_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/how-to-get-free-car-in-firestone-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/how-do-you-get-free-roblox_GM431946152.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/cheating-hacks-for-coin-master_GM406889139.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/pokemon-go-fake-gps_GM1094591345.pdfIn PDF document text
    • http://perpustakaan.akper-serulingmas.ac.id/repository/free-robux-instantly_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_off0000519f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x519F 25192 bytes
SHA-256: 213570b382b525cca82ae3bf13ab4288637dd0cb4852e59b25c011c466c4e21b
font_01_sfnt_off00008a78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8A78 18912 bytes
SHA-256: cc89d65e0e36737e1984ab6ac93203e67bd6180a76c56f9930e05f60a9f2cae3

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