Malicious PDF — malware analysis report

Static analysis result for SHA-256 c843544745b7a8b4…

MALICIOUS

PDF

34.6 KB Created: 2020-08-17 12:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1bc64ea47c868896d412aaa5adf36927 SHA-1: a2a9cb3505f07993dfc4f2d4feadb9d3ecfd2944 SHA-256: c843544745b7a8b42756b115b0e7d51702397ac49627c9a6ef86f9b8f8171916
152 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics for containing malicious redirector links and a link farm. The ML classifier also strongly indicated maliciousness. The document body contains a URL that points to a redirector, which in turn leads to a link farm hosted on Shopify. This suggests a tactic to obscure the ultimate destination and potentially distribute malware or phish for credentials. No scripts were extracted from this sample.

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.ru/pify?keyword=wordscapes+answers+daily+puzzle+september+17
    • http://files.roughlycut.com/uploads/1/3/0/7/130776601/tevapubetabozib.pdf
    • http://wifibop.fmhsabcmerchandise.com/uploads/1/3/1/3/131379326/4271d710e.pdf
    • https://cdn.shopify.com/s/files/1/0434/5944/4889/files/saremuxagapifarubitopij.pdf
    • https://cdn.shopify.com/s/files/1/0448/1181/3015/files/giwurovomop.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/49470024852.pdf
    • https://cdn.shopify.com/s/files/1/0434/6265/6152/files/26177852820.pdf
    • https://cdn.shopify.com/s/files/1/0436/4192/9886/files/boundary_wall_estimate.pdf
    • https://cdn.shopify.com/s/files/1/0432/1689/6159/files/puzaborofu.pdf
    • https://cdn.shopify.com/s/files/1/0434/2392/4376/files/xesovamamoxakopotaza.pdf
    • https://cdn.shopify.com/s/files/1/0429/3958/0575/files/91897394913.pdf
    • https://cdn.shopify.com/s/files/1/0431/7249/5524/files/buzonatiwemap.pdf
    • https://cdn.shopify.com/s/files/1/0440/6044/2774/files/nesaxipejibudalu.pdf
    • https://cdn.shopify.com/s/files/1/0437/0389/4171/files/30315111798.pdf
    • https://cdn.shopify.com/s/files/1/0435/7193/7441/files/sociology_of_literature_journal.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/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000049a8.bin
9c2941ac1bde0fc36d81008039e20c274e46226644e81d7dcb89151acff82586
pdf-font-stream PDF embedded font (sfnt) at offset 0x49A8 5748 bytes
font_01_sfnt_off00005d53.bin
6fa9f21aa011c3d6b5904d90f27fe9e1e7735720c70ef34aee1b91a5859ce0e7
pdf-font-stream PDF embedded font (sfnt) at offset 0x5D53 9416 bytes