Malicious PDF — malware analysis report

Static analysis result for SHA-256 2189035f2df14176…

MALICIOUS

PDF

45.3 KB Created: 2021-06-04 04:02:38 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 18e587196bc8c10f5bf4e63fd56ebb54 SHA-1: 3d8217e8195d162519fe3370fe5b44453e7f44fc SHA-256: 2189035f2df141767ca4ae81cf5658aa77c2b0a5de2f09c8e95af258229d95eb
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a lure related to 'free game hacks' and redirects to a URL that appears to be part of a link farm. The document body, though heavily obfuscated, contains text related to 'free roebucks on Roblox' and a URL. The presence of multiple PDF links suggests an attempt to drive traffic to various potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9864

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 https://netcdn.online/app/431946152/how-to-get-free-roebucks-on-roblox-game-hack PDF link annotation
    • https://pustaka.mic.sch.id//repository/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-please_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id/repository/free-robux-without-verify_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/games-that-give-you-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-co_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/where-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/hey-google-how-do-you-get-free-robux_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-free-stuff-links_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/hack-coin-master-app_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-hack-tool-pc-download_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-hack-dot-xyz_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-online-hack-no-survey-no-password_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-card-collection-in-coin-master_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-promo-codes_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/mcpe_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/pokemon-go-free-pokeballs-code_GM1094591345.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/coin-master-daily-free-spins-link-today-2021_GM406889139.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-without-human-verification-real_GM431946152.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/minecraft-pe-hack-client-2021_GM479516143.pdfIn PDF document text
    • https://pustaka.mic.sch.id//repository/free-robux-that-actually-works-2021_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_off00005496.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x5496 24800 bytes
SHA-256: 1e7ff2163d57c0c84df1deb7bd700a38018637d39d9dec6d722be3b046f0d2f6
font_01_sfnt_off00008dc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8DC3 18524 bytes
SHA-256: b7643ab87c6ede69648f322cd81a197be2475f7126f117e622ee98ccb7431d7c

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