Malicious PDF — malware analysis report

Static analysis result for SHA-256 15131c3cd8a1e3d9…

MALICIOUS

PDF

63.9 KB Created: 2020-07-28 19:27:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ebd5969e34cd40364988770fcb884557 SHA-1: 7f13c3880e0631c2e981308d07ba6126f3bc146d SHA-256: 15131c3cd8a1e3d99d2b05cc39c7ef1424158eee5b8d1e689c88b0fc5dcd500e
154 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, which is also present in the document body. The PDF also exhibits characteristics of a link farm, with numerous embedded URLs pointing to external PDF files, suggesting an attempt to manipulate search engine results or distribute content. The ML classifier strongly indicates maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • 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.cc/pify?keyword=lagu+you+raise+me+up+lyrics
    • http://files.artivism2019.com/uploads/1/3/1/8/131872238/sasibivos-zosuxuposepo.pdf
    • http://files.lucasswcd.org/uploads/1/3/2/3/132302859/1a4fbe4433e52.pdf
    • http://files.northlincsbeekeepers.org.uk/uploads/1/3/2/7/132710787/8653750.pdf
    • http://files.artemisassessment.ca/uploads/1/3/1/4/131410158/negijugo_jujezavexini_wadud_lelilevokeked.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/57790570823.pdf
    • https://cdn.shopify.com/s/files/1/0433/9276/2006/files/99600134620.pdf
    • https://cdn.shopify.com/s/files/1/0433/6753/0657/files/jasufuwe.pdf
    • https://cdn.shopify.com/s/files/1/0430/6829/3287/files/45436963371.pdf
    • https://cdn.shopify.com/s/files/1/0431/5122/9089/files/87845370468.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zonixalekena.pdf
    • https://cdn.shopify.com/s/files/1/0430/2385/9873/files/gevixani.pdf
    • https://cdn.shopify.com/s/files/1/0437/7106/8577/files/29409769927.pdf
    • https://cdn.shopify.com/s/files/1/0430/2058/3065/files/14140077249.pdf
    • https://cdn.shopify.com/s/files/1/0429/3863/0300/files/38941109283.pdf
    • https://cdn.shopify.com/s/files/1/0431/1754/3588/files/63760334843.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://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00009033.bin
c136d75d6bb8aa06547b0a265e347615c1ce090c317328326cfae5fc6e3d11fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9033 3928 bytes
font_01_sfnt_off00009e01.bin
af384adab8ac87442f73aa9ff6e9a0fd6fd0c54b71767434e2c1c863ec3c6953		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9E01 4992 bytes
font_02_sfnt_off0000af0a.bin
11d58b3ac763b2e80ab74f2685d0cda02f5c4a063a738f045e48eabdf3623883		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAF0A 14756 bytes
font_03_sfnt_off0000dd0a.bin
184efd0e138a9418359f6897f9ac56b5cd93cafbd57abf30711ac2aee7e18832		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0A 16120 bytes

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