Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb73a44b3904f66…

MALICIOUS

PDF

53.0 KB Created: 2020-08-30 08:16:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 06d7a06354098da2f693441ceeeabcf1 SHA-1: badecbc0c3c32d2c1d871b8567574722772e5b03 SHA-256: 5cb73a44b3904f66bf444d0de7974a729062041024236dc9dcb14b4e08171e49
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded links, including one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting a lure for a textbook, and the presence of many external PDF links indicates a link farm strategy. The heuristic 'PDF_SEO_LINK_FARM' and 'PDF_MALICIOUS_REDIRECTOR_LINK' strongly suggest this is a malicious SEO poisoning or link farm campaign designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ttraff.ru/wix?keyword=mechanics+of+materials+hibbeler+8th
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/6214/0840/files/tijuriwizovego.pdf
    • https://cdn.shopify.com/s/files/1/0436/9534/1723/files/apertura_inglesa_ajedrez.pdf
    • https://cdn.shopify.com/s/files/1/0435/9146/7176/files/purpose_driven_life_ebook_free_download.pdf
    • https://cdn.shopify.com/s/files/1/0431/0994/1415/files/94323541281.pdf
    • https://cdn.shopify.com/s/files/1/0434/5780/6488/files/zefuxipularixavabusoxo.pdf
    • https://static.usrfiles.com/ugd/0ad6c7_6d4a7038415c48b88f24f090be984462.pdf
    • https://static.usrfiles.com/ugd/934fc3_53a215d7d96e48e28050b71b470d42fc.pdf
    • https://static.usrfiles.com/ugd/24853a_3c90cebf52454073b57ab652e54f76b0.pdf
    • https://static.usrfiles.com/ugd/6908d7_c09e71e1b6d542a19c7fb1a8dec86e33.pdf
    • https://static.usrfiles.com/ugd/b8c837_9cb0c7f7e05c460f8636592472dbac9e.pdf
    • https://cdn.shopify.com/s/files/1/0428/8610/3207/files/castlevania_circle_of_the_moon_map.pdf
    • https://cdn.shopify.com/s/files/1/0431/1089/1680/files/12638299417.pdf
    • https://cdn.shopify.com/s/files/1/0432/5195/7923/files/kozarevenamigu.pdf
    • https://static.usrfiles.com/ugd/b8c837_6750a3ee64b34a2597d692cbba752b09.pdf
    • https://static.usrfiles.com/ugd/b8c837_c808b6b09c1e45648afa93b61cb4a8ea.pdf
    • https://static.usrfiles.com/ugd/54fa57_ffb6a8cb456a4e7fa451b99f06502f99.pdf
    • https://static.usrfiles.com/ugd/b8c837_b63ab28da6b54445acc7164b03dcbc32.pdf
    • https://static.usrfiles.com/ugd/a467d2_ec56f00d7f2140a1b3a305e13f7aeb5f.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0000a24f.bin
2357b36df465bd07db4458d735744e0235c88c3d9a5a06a6418be6752cb0f52d		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xA24F 20720 bytes
font_00_sfnt_off00006662.bin
060d1d118ee2efbfc05ee26eb5c9f427db773c92f5c947691ae9849b247d0923		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6662 5460 bytes
font_01_sfnt_off000078c7.bin
4be8d8f8a8417cd20cd8f890ba968204528523ee4826968895e263241e86e4e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C7 13280 bytes

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