Malicious PDF — malware analysis report

Static analysis result for SHA-256 612d361734c1db0e…

MALICIOUS

PDF

46.3 KB Created: 2020-08-03 10:55:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ef9c7b4485dd44cb674e736258dbd3b SHA-1: d13ca04ea83aa04230a365fc93f798d74f4f8760 SHA-256: 612d361734c1db0ebfb2c3d3dc8a28db0f9d8df919942c077484f574bf42c483
154 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, also contains the same malicious URL. The presence of numerous external links suggests a link farm or redirection attempt, likely to facilitate phishing or malware delivery. No scripts were extracted, but the critical heuristic firings strongly indicate malicious intent.

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=lobster+tail+carlo%2527+s+bakery
    • http://files.thebarometershop.co.uk/uploads/1/3/2/8/132814611/lebemepa.pdf
    • http://files.confluencelawcenter.com/uploads/1/3/0/7/130775893/7037133.pdf
    • http://files.insectcollective.com/uploads/1/3/1/4/131438211/c90bac.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0433/5622/5686/files/18635144530.pdf
    • https://cdn.shopify.com/s/files/1/0433/0127/3750/files/86257545310.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/66656561998.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/zavokalozetaxolemo.pdf
    • https://cdn.shopify.com/s/files/1/0429/1769/1559/files/fetch_api_example.pdf
    • https://cdn.shopify.com/s/files/1/0431/1033/4620/files/dunetisenewixemo.pdf
    • https://cdn.shopify.com/s/files/1/0436/4242/1398/files/zizusox.pdf
    • https://cdn.shopify.com/s/files/1/0437/5812/5207/files/14360589081.pdf
    • https://cdn.shopify.com/s/files/1/0437/5363/5989/files/26251915943.pdf
    • https://cdn.shopify.com/s/files/1/0432/1227/5870/files/nufanixetujavulasut.pdf
    • https://cdn.shopify.com/s/files/1/0433/4501/9045/files/34080503709.pdf
    • https://cdn.shopify.com/s/files/1/0428/4927/1975/files/3631431984.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_off0000769f.bin
ed80e0d18cffe2402be20ce409a2f4ae8929a76cb2d3c98cdf9227316d3f75da
pdf-font-stream PDF embedded font (sfnt) at offset 0x769F 5072 bytes
font_01_sfnt_off00008804.bin
f4302f2515ba082e587f4a5c4c10f509aae0135da6ec9654c1f272394a722ef9
pdf-font-stream PDF embedded font (sfnt) at offset 0x8804 10532 bytes