Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee768450f7aee8eb…

MALICIOUS

PDF

33.1 KB Created: 2021-07-03 16:11:50 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 67d9dccdd53741f8581337b05d8c5080 SHA-1: a13f602228af56f6b93f9bdc9563f89ba003e8fe SHA-256: ee768450f7aee8ebac0bf7caeb2562530b0a2243b44c96eb49877c74f80e1fac
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9824

Heuristics 5

  • 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.
  • PDF links to a 'free generator / game hack' redirector high 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.
  • 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 http://netcdn.tw/app/431946152/mobihack-roblox-hack-game-hack PDF link annotation
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/classic-builders-club-roblox-free_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-gamepass-in-any-games-roblox_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-promo-codes-for-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-robux-games-that-actually-work_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/coin-master-card-link-free_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-spins-coin-master_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/real-robux-codes_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/minecraft-anarchy-server-no-hacks_GM479516143.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/coin-master-daily-free-spins-hack_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/minecraft-book-collection_GM479516143.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-spin-link-for-coin-master-game_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-spin-coin_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/minecraft-images-free_GM479516143.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-roblox-accounts-with-robux-2021_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-spins-coin-master-app-ios_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/lazyblocks-com-robux_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/coin-master-hack-injection_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/freespinandcoin-blogspot-com_GM406889139.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • https://elearning.mialmarufbeyan.sch.id/__statics/gudangsoal/files/download-coin-master-hack-apk_GM406889139.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
font_00_sfnt_off00002c40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2C40 21908 bytes
SHA-256: 5c958f9aabc8cd0b94e95c11fffed80c88c277053ae5b850968861630afe6fdf
font_01_sfnt_off00005c80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5C80 19136 bytes
SHA-256: f16824342c62f00e4a9bb6916020d565fe0ae913315bb8cfdacdbfad2701e10e

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