Malicious PDF — malware analysis report

Static analysis result for SHA-256 647875272ff4d5ab…

MALICIOUS

PDF

68.8 KB Created: 2020-08-14 19:17:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 483390b78fd1f9dacb4ed6d8e398f924 SHA-1: 338fb549d627a4bb5a32750a48d1370ac1625aa5 SHA-256: 647875272ff4d5abbd73b2a583fa9e8caa6510831b3e08b41ea033a18e967fc5
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, specifically identified by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be the primary lure. The ML classifier strongly indicates maliciousness, and the presence of numerous external links suggests a link farm or SEO abuse tactic.

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.com/pify?keyword=commercial+sublease+agreement+template+uk
    • http://files.principledrywall.com/uploads/1/3/2/7/132741194/lidozisizet_moseb_jabaxo_rewugufixaguraw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/7079/0558/files/24941090511.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/61259485886.pdf
    • https://cdn.shopify.com/s/files/1/0428/8384/2215/files/3338248188.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/23281911610.pdf
    • https://cdn.shopify.com/s/files/1/0428/8974/0441/files/16302448248.pdf
    • https://cdn.shopify.com/s/files/1/0431/0751/6565/files/xslt_group_by.pdf
    • https://cdn.shopify.com/s/files/1/0445/8243/7028/files/ashrae_fundamentals_handbook_download.pdf
    • https://cdn.shopify.com/s/files/1/0452/7731/5233/files/14981284994.pdf
    • https://cdn.shopify.com/s/files/1/0438/5033/4368/files/pipojib.pdf
    • https://cdn.shopify.com/s/files/1/0430/3070/8375/files/melatozifiwuleko.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c5d0.bin
85b692c1c636aed9ab1240d2a7361179fdd6c0849396a06064984f922e967b4f
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5D0 2828 bytes
font_01_sfnt_off0000cfca.bin
c85ff8bb16ec69c338ba07e97f83df210f556c9cdd9e89be7f43caee1c5b5e14
pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 5360 bytes
font_02_sfnt_off0000e1e1.bin
ad193bfdde5c5a5750fb94503f80d0c92ded32b8f6b9f5b793df827ca6a47c78
pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E1 9868 bytes