Malicious PDF — malware analysis report

Static analysis result for SHA-256 f680088a502649c6…

MALICIOUS

PDF

42.1 KB Created: 2021-05-15 13:08:29 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-27
MD5: c6dddd189390c553ebf147fea7aab322 SHA-1: e9299d2ebb408988e53cabbb77d6e00478710504 SHA-256: f680088a502649c6c66438930734541c54eaac412b0328491fe98779be5a6992
220 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to known malicious redirectors and a link farm, disguised as "free generator" or "game hack" content. The document body, though partially corrupted, contains text related to "Get Free Robux Info" and a URL that aligns with the heuristic findings. The presence of numerous external links suggests an attempt to drive traffic to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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.
  • 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.
  • 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/get-free-robux-info-game-hack In PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/is-minecraft-free-on-xbox_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/minecraft-hack-client-18-9_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/best-minecraft-hacked-client-2021_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/make-robux_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/all-coin-master-spin-link-and-free-download_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/how-to-get-minecraft-for-free-on-ipad_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spin-and-coins-links-2021_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-free-spin-generator-without-human-verification_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-links-free-spins_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-no-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-coins-coin-master-today_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/my-minecraft-account-was-hacked_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/como-hackear-coin-master_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-hack-without-root_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-heaven-daily-free-spins-and-coins-links_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/coin-master-hack-mod-apk-free-download_GM406889139.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/best-free-minecraft-hacked-client_GM479516143.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/free-robux-without-human-verification-2021_GM431946152.pdfIn PDF document text
    • https://radiocaxias.com.br/portal/imagens/files/how-to-get-free-robux-without-downloading-any-apps_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_003_off000049f1.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x49F1 24596 bytes
SHA-256: 133be4795046f9217d7ee62112236c4eb19b4b3560bd7804cdb184ef4ff3d803
font_01_sfnt_off00008288.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8288 18120 bytes
SHA-256: 6e6e8bb7c0e640fc67837f70826b1bbd381eb05acf75ec047415621944091573

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