Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e39f2ebf43b2bd6…

MALICIOUS

PDF

40.8 KB Created: 2020-07-08 23:57:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dca8eac0e73cae92e7cf43adadf024b6 SHA-1: 3ecc81b6c43fbf034c5ec0d14e18799d69d2a349 SHA-256: 3e39f2ebf43b2bd64c9f651ece8934d065361f48d203424960f56257b8201f78
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm designed to appear as a SQL tutorial download, but the primary link redirects to a known malicious redirector. The PDF_MALICIOUS_REDIRECTOR_LINK and PDF_SEO_LINK_FARM heuristics confirm the malicious intent. The ML classifier also strongly indicated maliciousness. The document body, though partially corrupted, contains the lure text and the malicious URL.

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/wb?keyword=sql%20full%20tutorial%20pdf%20free%20download
    • http://files.injectiondepot.ca/uploads/1/3/1/4/131452870/fuvula-xunelesejo.pdf
    • http://files.kimsalinassilva.com/uploads/1/3/0/8/130814868/5943582.pdf
    • http://files.cobilconnect.com/uploads/1/3/0/9/130969853/6ea8d66a.pdf
    • http://files.hlhas.com/uploads/1/3/1/4/131483550/wuvoxipepuzan.pdf
    • http://files.florencefoplodge210.com/uploads/1/3/1/3/131379951/5199302.pdf
    • http://files.makwawamalawi.com/uploads/1/3/2/7/132740860/zuder.pdf
    • http://files.risingravenband.com/uploads/1/3/1/3/131384018/buvab.pdf
    • http://files.suncoastsoul.com/uploads/1/3/1/3/131379612/baretanemomimu.pdf
    • http://files.4arrowsoutdoors.com/uploads/1/3/0/8/130814672/1910526.pdf
    • https://meretuzuwoj.files.w
    • https://wudolatasuf.files.wordpress.com/2020/06/pifefemeb.pdf
    • https://sekaronokom.files.wordpress.com/2020/07/84953825168.pdf
    • https://niwujaregoz.files.wordpress.com/2020/06/luzezoxagafafapuros.pdf
    • https://xowubem.files.wordpress.com/2020/07/33349143872.pdf
    • https://jamofaj.files.wordpress.com/2020/06/70991604067.pdf
    • https://meretuzuwoj.files.wordpress.com/2020/07/dararifawaporexedil.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/wojilezufaguxulidumusad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/71061356311.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/85583151980.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/581871399.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53567737566.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nemevisofopanufu.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_off000061bc.bin
a28249625af2f86fae2cdde664f858c2d8d1e8c5902671687286f031af41d2e7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61BC 5060 bytes
font_01_sfnt_off00007309.bin
61f51bbaa1143869e348baeeb62ee79333fdbccb0df5e2fc0f8b73a96770d789		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7309 10304 bytes

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