Malicious PDF — malware analysis report

Static analysis result for SHA-256 531f045b20b9ec6c…

MALICIOUS

PDF

50.2 KB Created: 2021-05-11 09:03:48 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 6e23e9f81792df375c358207204a4ca9 SHA-1: ab54e36bdd89e67611ea22156691c5dd68f594ee SHA-256: 531f045b20b9ec6c7d995ac3df2c23eb329afed8566778ca218307e1ef511733
142 Risk Score

Malware Insights

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

This PDF document contains numerous links to external websites, many of which are hosted on domains associated with SEO link farms and promise game hacks or cheats. The document body itself contains a lure related to 'free Roblox shirt templates' and directs users to a URL that appears to be part of a malicious redirection chain. The presence of multiple PDF links and the ML classifier's high confidence score indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8594

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.xyz/app/431946152/free-roblox-shirt-templates-game-hack PDF link annotation
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-cards-hack_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/20-free-spin-link-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-time-speed-hack_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-hack-roblox-for-robux_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-spins-coin-master-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/minecraft-free-download-android-apk_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spins-link-2021-hack_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/youtube-how-to-get-free-robux_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-minecraft-mods-for-ps4_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-coins-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/coin-master-free-spin-link-today-2021_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-win-attack-madness-in-coin-master-hack_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/spin-free-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-generator-2021_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-no-download_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/how-to-get-minecraft-for-free-on-mac_GM479516143.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-hacks-no-verification_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/100-free-spins-for-coin-master_GM406889139.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/free-robux-codes_GM431946152.pdfIn PDF document text
    • https://www.corporateprofessionals.com/uploaded_files/userfiles/files/what-is-robux-in-roblox_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004ca9.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4CA9 25952 bytes
SHA-256: 6b9c0ced7b35b748937f829272a12e5bb9f082c6e14b4aefdd8697961bfc2224
font_01_sfnt_off00008916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8916 2824 bytes
SHA-256: 94c1b019735d7e491765340abe50b2897410e2ec65ecf141c08bd9f2220897c4
font_02_sfnt_off000092bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x92BF 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_03_sfnt_off00009fd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x9FD0 19000 bytes
SHA-256: 4e7a86c0c2dcb09bd31e1db046fb0bd5d665281e72db528aedf7d74cafa23941