Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecf7392f79274478…

MALICIOUS

PDF

46.2 KB Created: 2021-06-11 12:45:08 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-13
MD5: aa1141f18d760cc96a009b6199768554 SHA-1: 098ee3ef6a6aca378e2d5d62fb5e88bc93830b45 SHA-256: ecf7392f79274478a354326b8fd2ca5bda8d40c8087ee1738fa9f5eeba49c925
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains a large number of external links, many of which are SEO-optimized and point to sites offering 'free Robux' or similar game-related cheats. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and the ML classifier flagged it as malicious. The document body, though partially corrupted, contains references to 'Hacking Of Roblox Accounts' and a URL that aligns with this theme, suggesting a lure for users seeking in-game advantages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9832

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.tw/app/431946152/hacking-of-roblox-accounts-game-hack PDF link annotation
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-robux-generator-no-human-verification-pc_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/hack-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-tiktok-likes-no-survey_GM835599320.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/roblox-2021-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-free-spins-fb_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/how-to-get-free-robux-no-sign-in_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/gameoffice-net-hack-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/coin-master-spins-hack-2021_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-robux-generator-without-human-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/pubg-uc-app_GM1330123889.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/promo-codes-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-robux-no-verification-needed_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/moonactive-coin-master-free-spins_GM406889139.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/wahoo-gaming-co-free-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/launcher-dll-roblox-hack_GM431946152.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/minecraft-hacks-for-2b2t_GM479516143.pdfIn PDF document text
    • https://elearning.mtsnegeri8jember.sch.id/__statics/gudangsoal/files/best-minecraft-hacked-client-2021_GM479516143.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_off00005134.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5134 28492 bytes
SHA-256: 33865db56d0d05989f4b16c3e60b62b08cbe0c7822d48af8705f32f23bdc2f10
font_01_sfnt_off0000907f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x907F 18836 bytes
SHA-256: debbace04e5dcf02ff6205d2f3c2213921e7c6e90884e8f23649b81c7042a4cd

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