Malicious PDF — malware analysis report

Static analysis result for SHA-256 31219464fbcf8dbd…

MALICIOUS

PDF

40.7 KB Created: 2020-08-25 00:53:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f8deb76bdc565ecc5b5405a0627fca00 SHA-1: edbe8cc875a599142181891dc63f2b23fa448ef8 SHA-256: 31219464fbcf8dbd53d11478a40ae97704ea05f82d383e6cf7fd56487acb00f8
152 Risk Score

Malware Insights

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

The PDF document contains a prominent link that redirects to a malicious URL, disguised with a seemingly relevant keyword. This indicates a phishing or social engineering attempt to redirect the user to malicious infrastructure. The presence of numerous other PDF links, many pointing to suspicious domains, further supports this. The ML classifier strongly flagged this PDF as malicious.

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=how+to+back+up+images+on+android
    • http://xowuxugi.konzacoffeecompany.com/uploads/1/3/1/3/131398540/8b56fcc450e.pdf
    • http://files.dancingatthecrossroads.com/uploads/1/3/0/9/130969772/fanupami.pdf
    • http://files.pharmavetsa.com/uploads/1/3/2/8/132814276/9259902.pdf
    • http://files.mkwci.org/uploads/1/3/1/4/131408027/7806452.pdf
    • http://files.theharbourcc.ca/uploads/1/3/1/4/131437680/cbc217.pdf
    • https://cdn.shopify.com/s/files/1/0432/4327/4395/files/solirugunoxazaso.pdf
    • https://cdn.shopify.com/s/files/1/0430/5072/9621/files/nidaxefojefak.pdf
    • https://cdn.shopify.com/s/files/1/0438/3352/4386/files/dawilesitidaw.pdf
    • https://cdn.shopify.com/s/files/1/0431/2308/1378/files/davapakojasufuzutow.pdf
    • https://cdn.shopify.com/s/files/1/0429/7791/9129/files/puzuvumirafuxazuw.pdf
    • https://cdn.shopify.com/s/files/1/0432/3970/2687/files/aprendizajes_clave_2020_primaria.pdf
    • https://cdn.shopify.com/s/files/1/0429/4203/8172/files/pdf_to_ms_word_converter_free_download_windows_7.pdf
    • https://cdn.shopify.com/s/files/1/0427/7311/9143/files/fuvajopo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3551/6318/files/9961359960.pdf
    • https://cdn.shopify.com/s/files/1/0433/0058/5632/files/natamujitizanafagujuwomu.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_off00006020.bin
5fad0de37acf857022620e5ee8461bba9f64feae82016bba83d50b46e3c17f61
pdf-font-stream PDF embedded font (sfnt) at offset 0x6020 5616 bytes
font_01_sfnt_off00007327.bin
0cd9f2aa6f43c01fcd0d12aa13d5695d18c8611e1558c93a77eab6d8dc192af7
pdf-font-stream PDF embedded font (sfnt) at offset 0x7327 10212 bytes