Malicious PDF — malware analysis report

Static analysis result for SHA-256 84722be61d82d4d2…

MALICIOUS

PDF

55.7 KB Created: 2020-08-19 00:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2f107029d5ce4c6b9fd36d283474942a SHA-1: f79563c287ec1ee5c092b4e64688a94448d28886 SHA-256: 84722be61d82d4d23ddb0fdd5ed727102ab74199a6e9319289eff69336c34a37
162 Risk Score

Malware Insights

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

The PDF contains embedded links, one of which points to a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'accounting principles' and a URL that appears to be part of a link farm. The ML classifier also strongly indicated maliciousness. The presence of multiple external links, including a redirector, suggests an attempt to lead the user to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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.com/pify?keyword=accounting+principles+10th+edition+solutions+free
    • http://files.setsunlimited.com/uploads/1/3/1/8/131856079/jizezepimol.pdf
    • http://sadute.panyabistro.com/uploads/1/3/0/8/130813420/4878048.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/3754/1031/files/sevemizazodi.pdf
    • https://cdn.shopify.com/s/files/1/0435/4346/2037/files/calicatas_de_suelos_agricolas_pdf.pdf
    • https://cdn.shopify.com/s/files/1/0434/5525/0598/files/99985414126.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/32773531818.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/571475918.pdf
    • https://cdn.shopify.com/s/files/1/0432/2741/4696/files/mowowepolo.pdf
    • https://cdn.shopify.com/s/files/1/0431/7691/9194/files/mubenuteripiletede.pdf
    • https://cdn.shopify.com/s/files/1/0439/3995/4856/files/steven_s_skiena_the_algorithm_design_manual.pdf
    • https://cdn.shopify.com/s/files/1/0434/1114/4858/files/59197399297.pdf
    • https://cdn.shopify.com/s/files/1/0437/5222/6974/files/63512947451.pdf
    • https://cdn.shopify.com/s/files/1/0431/4189/0208/files/93553584759.pdf
    • https://cdn.shopify.com/s/files/1/0429/5557/1353/files/how_to_download_a_file_from_github.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008db5.bin
b07cbad888efb77c3baaac77bc2f29e0ee8499c64d3d318af3658024ca3574c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DB5 5388 bytes
font_01_sfnt_off0000a010.bin
31ac484dfbf8345ba1011fc81aeb21f8bb4955c6aa5f1e645044a6740ef60e39		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA010 16072 bytes

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