Malicious PDF — malware analysis report

Static analysis result for SHA-256 63181cae8f65c199…

MALICIOUS

PDF

44.9 KB Created: 2021-05-19 08:08:31 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 3cb46815bb45c1164162c6baf87ce7cd SHA-1: 6e5a7534e88772e953d09110422ee9ed58e4faac SHA-256: 63181cae8f65c19933e288fbd694ffbb8556c884b8f500337fa16b8b2c56a341
200 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document contains multiple links that redirect to malicious infrastructure, specifically promoting 'free Robux' and game hacks, while impersonating the eBay brand. The primary malicious link is https://netcdn.xyz/app/431946152/claim-free-robux-game-hack, which is designed to trick users into clicking through to a potentially harmful site. The presence of embedded URLs and the ML classifier's high confidence score indicate a malicious intent to deceive users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9632

Heuristics 5

  • 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.
  • Brand-impersonation credential phishing lure high SE_BRAND_CREDENTIAL_PHISH
    Document impersonates a well-known consumer brand and uses account-security / verification language ('unusual activity', 'account on hold', 'verify your account') to steer the reader to a credential-harvesting link. Corroborated by: call-to-action link host does not match the impersonated brand: https://netcdn.xyz/app/431946152/claim-free-robux-game-hack.
  • 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/claim-free-robux-game-hack In PDF document text
    • http://seniornetwanganui.org.nz/images/minecraft-java-edition-key-free_GM479516143.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/coin-master-hack-mod-apk-2021-download_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/minecraft-dungeons-free_GM479516143.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/roblox-lovenet_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-spins-and-coins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/rblx-city-free-robux_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/robux-scam_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/give-free-robux_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-robux-websites-that-actually-work-2021_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/robux-com-free-robux_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/coin-master-daily-gift-free-spins-and-coins-link_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-spins-and-coins-for-coin-master_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-robux-generator-no-verification_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/how-to-get-free-robux-codes_GM431946152.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/free-spins-coin-master-links-twitter_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/hack-mod-coin-master_GM406889139.pdfIn PDF document text
    • http://seniornetwanganui.org.nz/images/get-free-robux-no-verification_GM431946152.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_003_off00004733.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4733 25876 bytes
SHA-256: 259e0b51d6b2863ed037aabf8e5bb24af3ba973430f5b4dc575e184636aeeb3c
font_01_sfnt_off00008232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8232 2832 bytes
SHA-256: 77ae1c4cffa647a8fd533dfa4102e94364989f9e80b9cd131876e9d1005899a2
font_02_sfnt_off00008be3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8BE3 18696 bytes
SHA-256: 5cf9f9319346d61d0cee7eea738a99b5b91b4687cc89c43f6f5509699f250cff

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