Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc494c1d5537554b…

MALICIOUS

PDF

35.5 KB Created: 2021-06-21 18:44:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: dd3faf57f8141fe611db33310a3eef6e SHA-1: abd25e1d9903ecdd77e8f42fcd2febef6184c9f9 SHA-256: cc494c1d5537554b60a043fdaf43afd9d6f39851cb78c4e39720b46cecedda73
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 0.9980

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.co/app/431946152/how-to-get-a-free-boombox-on-roblox-high-school-game-hack PDF link annotation
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-hack-xyz-download_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-free-robux-2021-easy_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-play-minecraft-for-free-on-pc_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-free-things-on-roblox_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-install-minecraft-for-free-on-ios_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-free-unblocked_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-robux-site_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/free-coin-and-spin-link_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-hack-without-human-verification-2021_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/coin-master-free-online-game_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-100-robux-on-roblox-free-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/pokemon-go-free-latest-version_GM1094591345.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-free-robux-in-seconds-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/minecraft-pe-015-0-apk-free-download_GM479516143.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/robux-hack-generator-secret_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/hack-coin-master-using-cheat-engine_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-hack-coin-master-without-root_GM406889139.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/how-to-get-robux-for-free-2021_GM431946152.pdfIn PDF document text
    • https://dribledasortegaucho.com.br/uploads/files/roblox-hacks-to-get-free-robux-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
font_00_sfnt_off000032bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x32BF 22360 bytes
SHA-256: cb591d278c5d17e9d3db428295de5fb2002be872530ab826f473d252356a3530
font_01_sfnt_off00006488.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6488 19464 bytes
SHA-256: 37c7d4e4753b75d1595e8cd1209ae86613d16bdb2164a836da4a890fb6cff502

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