Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d5f163ec705b7e…

MALICIOUS

PDF

46.0 KB Created: 2021-05-14 02:30:37 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 26675b1c7f15a2684f74f55e1487ec50 SHA-1: 80d5e99a6892c48aa749242f371ab5467faf17a2 SHA-256: 87d5f163ec705b7ec6157b89d3efa22c4ccf05a360d6d49387e728af8f51cf3b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded links, many of which are part of a link farm designed to direct users to pages offering "hacks" or "free spins" for online games. The ML classifier strongly indicated maliciousness, and the presence of a "download button" lure reinforces the deceptive nature of the document. While no scripts were explicitly extracted, the PDF structure and extensive external linking suggest an attempt to drive users to malicious websites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 4

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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.xyz/app/406889139/free-spins-on-coin-master-game-game-hack PDF link annotation
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/coin-master-33-hack-version-download_GM406889139.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/mobihack-net-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/daily-free-spin-coin-master-link_GM406889139.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/haktuts-coin-master-free-spin-link_GM406889139.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-link_GM406889139.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/coin-master-apk-hacked-3526_GM406889139.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/roblox-skin-free_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/old-roblox-accounts-for-free_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-easy-hack_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/robuxmatch-com-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/how-to-hack-a-minecraft-account_GM479516143.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/how-to-get-free-roebucks-without-verification_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/roblox-svg-free_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/coin-master-free-spins-hack-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/coin-master-hack-online-no-human-verification_GM406889139.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/games-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/what-games-on-roblox-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://elearningmts.mapersis31banjaran.sch.id/__statics/gudangsoal/files/free-coin-master-spins-2021_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off0000503f.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x503F 24428 bytes
SHA-256: 30319014f4b469dfee4e5c26c1aa2a2f53a335dd4ae86fa0f00de8ca10f64c55
font_01_sfnt_off000087bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x87BF 2880 bytes
SHA-256: 10d025f04f706eb71cdda4f99784df1b9ccb52e48080e43095e0398eaef6f132
font_02_sfnt_off000091a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x91A9 18148 bytes
SHA-256: b1f30c98449655e0c119849c00bf29bb9bd656252beb56b2567f3adea4b6d957

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