Malicious PDF — malware analysis report

Static analysis result for SHA-256 1fb1fece44e1f593…

MALICIOUS

PDF

49.1 KB Created: 2021-06-07 08:22:51 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7)
MD5: ad523dd842f646f47ab4d8ddf5312b7d SHA-1: d6198728e78a77b055c317ee97978fde57f11bad SHA-256: 1fb1fece44e1f59391eac5c95b08be0f8af136cc9de58449726ee4f27a851a90
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which are SEO-optimized slugs pointing to game-related content, suggesting a link farm or SEO spam campaign. The presence of a 'download button' heuristic and the ML classifier's high confidence further support a malicious intent. The document body, though partially corrupted, contains a URL that aligns with the external links found.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9796

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/jailbreak-cheats-roblox-money-game-hack
    • http://elibrary.smknesbu.sch.id/repository/how-to-get-100-robux-for-free_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-site_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-coin-master-cards_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-link-blogspot_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-do-i-get-free-robux-on-roblox_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/how-do-u-get-free-robux-2021_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-free-spins-app_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/games-like-coin-master-for-free_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey-2021_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-spin-and-coin-blogspot-com_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/give-free-robux_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-minecraft-java-edition_GM479516143.pdf
    • http://elibrary.smknesbu.sch.id/repository/mcpe-master-coin-hack-apk_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-apps-that-work_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-no-human-verification-or-survey-or-download_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/pokemon-go-free-quest-guide_GM1094591345.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-card-codes_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-robux-android_GM431946152.pdf
    • http://elibrary.smknesbu.sch.id/repository/coin-master-hack-mod-apk-2021-download_GM406889139.pdf
    • http://elibrary.smknesbu.sch.id/repository/free-roblox-premium_GM431946152.pdf
    • http://en.wikipedia.org/wiki/MIT_License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000542a.bin
059d70b8a18dfd7094dee50da1c26170fd4740472048bcc1061ac616b331b931		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x542A 25040 bytes
font_01_sfnt_off00008de4.bin
450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DE4 5696 bytes
font_02_sfnt_off00009af5.bin
ff2e1b49633db17d88e95e1b824eb37a95b121881613fe160ee6c5c9fc6c5858		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9AF5 19116 bytes

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