Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1774cf6889b1246…

MALICIOUS

PDF

45.0 KB Created: 2020-07-31 07:17:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c7ec892cb5176769a035aaa6ca70d028 SHA-1: 34a0175cc67aacc11e4b62298bafb5d17045e494 SHA-256: b1774cf6889b124691e55030564c1c0032360d2b0e6f5547727a7b34980a8077
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains numerous links, including one pointing to a known malicious redirector. The ML classifier strongly indicates maliciousness. The document body, though heavily obfuscated, contains text related to legal terms, suggesting a lure. The primary malicious IOC is the redirector URL, which likely leads to further malicious content or phishing pages.

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=caveat+emptor+and+caveat+venditor+pdf
    • http://files.jenniferhilt.com/uploads/1/3/2/7/132712050/9686092.pdf
    • http://files.solerconsulting.com/uploads/1/3/2/6/132696015/xuxugiguvo.pdf
    • http://files.fireflytoysandgames.com/uploads/1/3/0/7/130738569/savaxaxepokemisi.pdf
    • http://files.artofarchitecting.com/uploads/1/3/2/3/132303269/jomije.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/18983443830.pdf
    • https://cdn.shopify.com/s/files/1/0429/5963/4591/files/56009966624.pdf
    • https://cdn.shopify.com/s/files/1/0437/0723/6503/files/jexorefegewulunun.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/99913566500.pdf
    • https://cdn.shopify.com/s/files/1/0434/8379/1517/files/13289148116.pdf
    • https://cdn.shopify.com/s/files/1/0430/9254/1589/files/xorutupodad.pdf
    • https://cdn.shopify.com/s/files/1/0436/5965/7374/files/60414041704.pdf
    • https://cdn.shopify.com/s/files/1/0433/5458/7288/files/75311441580.pdf
    • https://cdn.shopify.com/s/files/1/0429/4272/6310/files/silude.pdf
    • https://cdn.shopify.com/s/files/1/0428/9105/1161/files/36961980890.pdf
    • https://cdn.shopify.com/s/files/1/0433/9915/1768/files/duxekagibatupamuw.pdf
    • https://cdn.shopify.com/s/files/1/0431/3173/2132/files/25100006791.pdf
    • https://cdn.shopify.com/s/files/1/0435/5234/2184/files/70407250791.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/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/999135665

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c4.bin
4d99a656403c07966b41bf2fe54820dda08cbf58ed4256c78da4d200d0829086
pdf-font-stream PDF embedded font (sfnt) at offset 0x73C4 4964 bytes
font_01_sfnt_off00008492.bin
959ee76c8cd20fe4005d676a9b62dbf9c283a678c2d8ee7dc4bfbca36d94af2d
pdf-font-stream PDF embedded font (sfnt) at offset 0x8492 10000 bytes