Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3e1d30346c1e06f…

MALICIOUS

PDF

51.4 KB Created: 2021-06-03 11:38:15 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 031fd55a3f166375e2f81582b5ee51d7 SHA-1: 6b708588b7d1f3e6e38d2aeae7ad9a6554085b51 SHA-256: e3e1d30346c1e06f34a905dce99240f6f3db72b2786f03c133bb30abf26f26d2
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 0.9724

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/free-robux-quiz-game-hack PDF link annotation
    • http://oca.undil.tl/repository/coin-master-free-spins-moonactive_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-unlimited-spins-and-coins-cheats_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-game_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-robux-sites-2021_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-hack-spins-android_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-minecraft-bedrock-for-free_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/haktuts-coin-master-free-spins-2021_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-spins-blogspot_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/get-free-robux-generator_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-roblox-hair-girl_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-link-for-spins_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-get-robux-easy_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/free-minecraft-svg-cutting-files_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/websites-that-give-free-robux_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/coin-master-free-coins-and-spins-app_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/earn-robux-for-roblox_GM431946152.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-make-a-minecraft-client_GM479516143.pdfIn PDF document text
    • http://oca.undil.tl/repository/download-coin-master-free-spins-link-2021-today_GM406889139.pdfIn PDF document text
    • http://oca.undil.tl/repository/how-to-download-minecraft-for-free-on-windows_GM479516143.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_004_off00004f48.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4F48 34092 bytes
SHA-256: 1adaf32224e9c711d17c63d8a9e80c7b8f25f237b094a14bb48ceb69a1f35b54
font_01_sfnt_off00009c26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9C26 2912 bytes
SHA-256: fa76cc2dab30b56d5305de71ce949b6adffd6580af2f26905a33966a3200adbb
font_02_sfnt_off0000a622.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA622 18376 bytes
SHA-256: b52519a3f27e6183245bec6d77d3cda93d913202ea7147b0d6d9048d316cd5fc

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