Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c6c8f2f5d358cd3…

MALICIOUS

PDF

44.5 KB Created: 2020-08-02 23:40:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 13ad6dfc0a246856f9e9819bc76e66ca SHA-1: f592b05f058b8ca61b1e4833dfd341661146a380 SHA-256: 5c6c8f2f5d358cd3f27716f6584c375954dcc2a55ca9bad7cb1b9affd436e4f5
154 Risk Score

Malware Insights

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

The PDF contains a heuristic firing for a malicious redirector link, which is also present in the document body disguised as song lyrics. This link, 'https://ttraff.cc/pify?keyword=shots+imagine+dragons+lyrics', leads to known malicious infrastructure. The document also exhibits characteristics of a link farm, with numerous embedded URLs pointing to PDF files, suggesting an attempt to manipulate search engine results or distribute further malicious content. The ML classifier also strongly indicated 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=shots+imagine+dragons+lyrics
    • http://files.hinesburgartistseries.org/uploads/1/3/1/4/131406811/8142778.pdf
    • http://files.weddingofficiantnj.com/uploads/1/3/1/4/131408798/a1cfbf105.pdf
    • http://files.artbeyondthedivide.org.au/uploads/1/3/0/8/130813325/vevopirinofuruzevu.pdf
    • http://files.robinsonclarinets.com/uploads/1/3/1/4/131453114/6e43734.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/8576/6561/files/naui_standards_and_policies_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/9896/4117/files/18178817201.pdf
    • https://cdn.shopify.com/s/files/1/0430/8929/7568/files/94964057475.pdf
    • https://cdn.shopify.com/s/files/1/0431/7279/0428/files/27894740941.pdf
    • https://cdn.shopify.com/s/files/1/0431/2521/1296/files/93163879396.pdf
    • https://cdn.shopify.com/s/files/1/0431/8419/3696/files/60589705042.pdf
    • https://cdn.shopify.com/s/files/1/0432/0156/0737/files/79206650429.pdf
    • https://cdn.shopify.com/s/files/1/0428/2885/7503/files/49987741326.pdf
    • https://cdn.shopify.com/s/files/1/0432/1991/0811/files/3668254731.pdf
    • https://cdn.shopify.com/s/files/1/0440/8741/0840/files/76424401621.pdf
    • https://cdn.shopify.com/s/files/1/0429/5704/5913/files/yah_reserved_fandango_meaning.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000577b.bin
bddd0d682284947f18f749eecd6de6eeda54d7657d1e102c9a173b5ec6bd0db4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x577B 5560 bytes
font_01_sfnt_off00006a37.bin
6272fcc5b31a8d4befe9da0be9caa68347c065d2eebd4a4bcda9993c8d4d27f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6A37 10308 bytes
font_02_sfnt_off00008d78.bin
93ff2a8c91b3cdac7635b635b8f6727a5d4f47a0e88d3dab014db79fc2881319		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D78 16772 bytes

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