Malicious PDF — malware analysis report

Static analysis result for SHA-256 1958d0069832c468…

MALICIOUS

PDF

42.6 KB Created: 2020-08-13 22:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e3e7dd42bdc5e1be0f65b431569db728 SHA-1: 5838edd84c1a78cac73cbb281b01abb2d41b63d6 SHA-256: 1958d0069832c46827d7d23bd3aef972617adfbfb270050eaa04c3d3c40c3c82
162 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a known malicious redirector. The document body, though heavily obfuscated, contains text suggesting a lure related to 'calendar 2018 excel free' and includes the malicious URL. The presence of a link farm and ML classification further support its malicious nature, indicating it's likely used for phishing or malware distribution.

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=calendar+2018+excel+free
    • http://files.devinhuntillustration.com/uploads/1/3/1/4/131452977/7212833.pdf
    • http://files.sthlmtapas.se/uploads/1/3/1/4/131483002/7082018.pdf
    • http://nobajuk.mikebergenart.com/uploads/1/3/1/6/131606490/nuxoge-givim-pivipokagarir.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5537/3720/files/8446104366.pdf
    • https://cdn.shopify.com/s/files/1/0434/4204/5090/files/array_in_java.pdf
    • https://cdn.shopify.com/s/files/1/0427/9602/3975/files/jisilajuzogexaxara.pdf
    • https://cdn.shopify.com/s/files/1/0438/2733/1232/files/56666935309.pdf
    • https://cdn.shopify.com/s/files/1/0430/2798/8634/files/36911905408.pdf
    • https://cdn.shopify.com/s/files/1/0439/8389/6734/files/pelavepuv.pdf
    • https://cdn.shopify.com/s/files/1/0428/5346/6271/files/52075868801.pdf
    • https://cdn.shopify.com/s/files/1/0436/9845/4682/files/63370335877.pdf
    • https://cdn.shopify.com/s/files/1/0434/5928/1048/files/70253259282.pdf
    • https://cdn.shopify.com/s/files/1/0437/5327/5546/files/vikelijajegapemidixewufab.pdf
    • https://cdn.shopify.com/s/files/1/0432/6499/9590/files/lowolatetodijakisosudixej.pdf
    • https://cdn.shopify.com/s/files/1/0428/5032/0543/files/20932977339.pdf
    • https://cdn.shopify.com/s/files/1/0435/9297/4499/files/48772763117.pdf
    • https://cdn.shopify.com/s/files/1/0454/1018/9480/files/19037131710.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_off00006710.bin
a8e26f94116d231b787b76a280167f67dbb14bda663adffe7aa2e0566fcdeb99		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6710 5332 bytes
font_01_sfnt_off00007945.bin
9ec3a90c5a06f848bb4cd6904afdec326b986c8ee037a577e4a4b2ce1e86a530		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7945 10524 bytes

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