Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82ec4adfae9ae3f…

MALICIOUS

PDF

41.2 KB Created: 2021-05-10 22:04:10 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-24
MD5: bbba7177f6ac77fd5110184b0cf837b1 SHA-1: ae2d98fa244a49a7846dd4f193862e8778bf059a SHA-256: c82ec4adfae9ae3f64a4e9f0ec1997e4b846dcdf218644157a419856161c3554
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors, specifically advertising 'free Robux' or game hacks. The primary redirector URL is https://netcdn.xyz/app/431946152/free-robux-no-verify-game-hack. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest a social engineering lure designed to lead users to potentially malicious websites or further downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical 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. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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.xyz/app/431946152/free-robux-no-verify-game-hack In PDF document text
    • http://lakeshistory.com/images/how-to-get-free-robux-without-offers_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/free-spin-coin-master-app-download_GM406889139.pdfIn PDF document text
    • http://lakeshistory.com/images/coin-mast-hacks_GM406889139.pdfIn PDF document text
    • http://lakeshistory.com/images/rich-free-roblox-accounts_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/robux-hack-no-human-verification_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/coin-master-email-rewards-link_GM406889139.pdfIn PDF document text
    • http://lakeshistory.com/images/optifine-mcpe_GM479516143.pdfIn PDF document text
    • http://lakeshistory.com/images/tryrbx-site-free-robux_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/how-to-get-free-admin-in-roblox_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/minecraft-bedrock-edition-free-with-java_GM479516143.pdfIn PDF document text
    • http://lakeshistory.com/images/free-roblox-hack-us_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/free-coins-coin-master-hack_GM406889139.pdfIn PDF document text
    • http://lakeshistory.com/images/how-to-get-free-robux-without-verification-or-surveys_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/https-rbx-place-rewards_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/hack-coin-master-online_GM406889139.pdfIn PDF document text
    • http://lakeshistory.com/images/roblox-apk-hack_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/free-robux-generator-codes_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/free-coins-coin-master-2021_GM406889139.pdfIn PDF document text
    • http://lakeshistory.com/images/how-to-get-free-robux-youtube_GM431946152.pdfIn PDF document text
    • http://lakeshistory.com/images/master-game_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
stream_003_off000046c9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x46C9 24292 bytes
SHA-256: 04f05cdce437d8ef8859164623ceb3117c5bb696ae01f938adfc233eb5d95d51
font_01_sfnt_off00007e0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x7E0D 18448 bytes
SHA-256: c82a2e535d1b02ce633786be567827726fc21df48f71ae9cb05a1d9866072f5e

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