Malicious PDF — malware analysis report

Static analysis result for SHA-256 51090519a894c333…

MALICIOUS

PDF

46.0 KB Created: 2021-05-20 07:08:32 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7551c93deb82b99f7c5a27efa39f83d3 SHA-1: 52da5aaade34f847bc7dd2a288b32e5df911ee53 SHA-256: 51090519a894c333af03009830965fde0cadc03a563dcb0cf0348aa4fea09e6b
102 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which are SEO-optimized and point to gaming-related topics like 'how to scam on Roblox' and 'free Robux'. The ML classifier strongly indicated maliciousness, and the presence of numerous links suggests a link farm or redirection scheme. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or scam attempt, likely leading to further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9432

Heuristics 4

  • 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
  • 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/how-to-scam-on-roblox-game-hack PDF link annotation
    • http://algierimasonry.com/images/hack-minecraft_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spin-and-coin-links_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-70-spin-link-today_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-that-actually-works-2021_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-download-minecraft-for-free-ios_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-mod-apk-2021_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-without-any-verification_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-a-free-raid-pass_GM1094591345.pdfIn PDF document text
    • http://algierimasonry.com/images/www-robux-us_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-spins-coin-master-no-survey_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/coin-master-mod-free-download_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/how-do-you-install-minecraft-for-free_GM479516143.pdfIn PDF document text
    • http://algierimasonry.com/images/robux-hack-2021_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-hack-roblox-accounts-2021-easy_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-can-i-get-free-robux_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/2021-roblox_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/free-coin-master-spins-blog_GM406889139.pdfIn PDF document text
    • http://algierimasonry.com/images/free-robux-without-downloading-apps_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/how-to-get-free-robux-without-doing-anything-2021_GM431946152.pdfIn PDF document text
    • http://algierimasonry.com/images/daily-free-spins-coin-master-app_GM406889139.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_003_off00004622.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x4622 26520 bytes
SHA-256: 51217be10938719dddd62dbf9d2d12e37318cb6f899bf041e336ee6552fe2abc
font_01_sfnt_off000083a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x83A1 5696 bytes
SHA-256: 450e3ee45915afe13702bf1d587eb8b9ad88a8d2113419ac9f2fd116a828e139
font_02_sfnt_off000090b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x90B2 18436 bytes
SHA-256: 34f93b6f39f5197ad83579d8861054fdfd3ef28e5805cfd87bb9002912825c3f

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