Malicious PDF — malware analysis report

Static analysis result for SHA-256 db8e51817ef5d9a9…

MALICIOUS

PDF

42.0 KB Created: 2020-08-05 12:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 03b76a31e14f03891ceeab163f4fa858 SHA-1: 824c355900a35d2572fc53b92ee7ba1cc0e08d1c SHA-256: db8e51817ef5d9a967803a57e9a18af0f8a1a8f12411984018292574a574a981
150 Risk Score

Malware Insights

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

The PDF document is identified as malicious due to a high ML score and the presence of a critical heuristic indicating it links to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains text suggesting it is a lure for 'America's test kitchen recipes pdf'. The primary malicious IOC is the redirector URL, which likely leads to further malicious content. The PDF also hosts a large number of external links, many pointing to Shopify domains, which is characteristic of a link farm used for SEO poisoning or distributing malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • 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=america+s+test+kitchen+recipes+pdf
    • http://files.workpersona.com/uploads/1/3/2/7/132741241/mikumenajowa-mixewefola-zeseroruzukik-vinukeret.pdf
    • http://files.pamah.org/uploads/1/3/1/3/131398477/lelejeniwuvebef.pdf
    • http://files.jnafhc.com/uploads/1/3/1/8/131871745/jofawelufatag-zubinepifaxa-xikaruwavaviga.pdf
    • http://files.sandersinkstudio.com/uploads/1/3/1/1/131164399/9798423.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/53293114795.pdf
    • https://cdn.shopify.com/s/files/1/0428/8184/3353/files/mopawodigode.pdf
    • https://cdn.shopify.com/s/files/1/0434/3011/7542/files/definition_of_family_structure.pdf
    • https://cdn.shopify.com/s/files/1/0429/1228/4831/files/60968900327.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/visaboxe.pdf
    • https://cdn.shopify.com/s/files/1/0431/6259/9586/files/kuzetobakudipuzavezufot.pdf
    • https://cdn.shopify.com/s/files/1/0434/5207/2086/files/16598219932.pdf
    • https://cdn.shopify.com/s/files/1/0431/2737/3986/files/69316220119.pdf
    • https://cdn.shopify.com/s/files/1/0431/5742/2229/files/old_testament_seminary_teacher_manual.pdf
    • https://cdn.shopify.com/s/files/1/0429/3420/6620/files/gijadadixaxumidemefijulud.pdf
    • https://cdn.shopify.com/s/files/1/0430/0223/2983/files/89738652473.pdf
    • https://cdn.shopify.com/s/files/1/0433/4416/7064/files/libib.pdf
    • https://cdn.shopify.com/s/files/1/0428/1804/4063/files/febedosunigudit.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_off00006644.bin
3b8d3d0fc7c01860c62b43fc5ddc91d9b966b937dd37dbb21bb041d0324f209b
pdf-font-stream PDF embedded font (sfnt) at offset 0x6644 5416 bytes
font_01_sfnt_off00007886.bin
a15cf6edc471b7638ea59c0b875c4e76855b064dba4ddee0d658f73904fcb063
pdf-font-stream PDF embedded font (sfnt) at offset 0x7886 10104 bytes