Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f72bb86c427fda3…

MALICIOUS

PDF

42.6 KB Created: 2020-08-22 04:30:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6181fd21d1a7eeba0c0da633f4d0e8ab SHA-1: f89abb4fca1be7476a9fd26837146ab5d09e3b1c SHA-256: 6f72bb86c427fda32ccf49e9a23d63f7f827ce86845fd9b46dca1d5b80c98f1b
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which are disguised as PDF files hosted on Shopify. The primary malicious link, 'https://ttraff.ru/pify?keyword=brecon+high+school+estyn+report', is flagged as a known malicious redirector. This indicates a link farm or SEO poisoning tactic designed to drive traffic to malicious infrastructure.

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=brecon+high+school+estyn+report
    • http://files.newbornknots.com/uploads/1/3/0/7/130740130/f15ff7.pdf
    • http://files.westcoastminitruckers.com/uploads/1/3/0/7/130775537/2096428.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/5031/1579/files/dinobotepejibawesetosi.pdf
    • https://cdn.shopify.com/s/files/1/0435/7675/4344/files/90247163261.pdf
    • https://cdn.shopify.com/s/files/1/0431/0473/1300/files/95473771367.pdf
    • https://cdn.shopify.com/s/files/1/0431/4749/3536/files/33274290798.pdf
    • https://cdn.shopify.com/s/files/1/0437/1221/7241/files/mercruiser_3._0_manual.pdf
    • https://cdn.shopify.com/s/files/1/0430/5652/9565/files/34529545550.pdf
    • https://cdn.shopify.com/s/files/1/0432/4743/5940/files/12330802147.pdf
    • https://cdn.shopify.com/s/files/1/0431/7731/2405/files/50212147913.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/20931566490.pdf
    • https://cdn.shopify.com/s/files/1/0446/9365/1610/files/amalgamador_millenium_2020.pdf
    • https://cdn.shopify.com/s/files/1/0430/3532/8663/files/textile_definitions_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0436/1378/2173/files/zerisavuganiwizilifixe.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_off000069d3.bin
2405281a2deb62ab067dab8fee505ff71f794fa6d733446d582092e7040b2b9b
pdf-font-stream PDF embedded font (sfnt) at offset 0x69D3 5136 bytes
font_01_sfnt_off00007b51.bin
b5eafc2ae3430df1c1f6eda18b6c63d0de1259c4a24ce294579cd14e5b195fac
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B51 10076 bytes