Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c064f93dc60061b…

MALICIOUS

PDF

38.9 KB Created: 2020-08-09 00:48:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e13305cbddd5c7833b7a0a34a3150d6b SHA-1: 916caff7337604c41cb233d9c13ed3decf8e6359 SHA-256: 8c064f93dc60061be1923552fc9d3195ed46c8b54086114929464509a41eb90a
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to Shopify domains, but one critical link directs to a known malicious redirector. The document body, though partially corrupted, contains text related to a Portuguese-Spanish dictionary and the malicious URL, suggesting a lure to a phishing or malware distribution site. The ML classifier strongly flagged this PDF as malicious.

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=diccionario+portugues+brasil+espa%25C3%25B1ol+pdf
    • http://files.devlindesignstudio.com/uploads/1/3/2/7/132740540/5481416.pdf
    • http://files.iscariotstories.com/uploads/1/3/0/7/130738620/7f48eee3c.pdf
    • http://files.mtbafrica.com/uploads/1/3/1/4/131482968/purelap-tilizogoxibax-vuxigorajiwete-roxus.pdf
    • https://cdn.shopify.com/s/files/1/0435/5201/4491/files/search_only_for_files_on_google.pdf
    • https://cdn.shopify.com/s/files/1/0434/4433/8838/files/gelijidefodomobopog.pdf
    • https://cdn.shopify.com/s/files/1/0429/5789/7882/files/begilaw.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/8007882555.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/nubizasijimowedemo.pdf
    • https://cdn.shopify.com/s/files/1/0432/1745/3211/files/57008866576.pdf
    • https://cdn.shopify.com/s/files/1/0439/1777/0904/files/ambiente_organizacional.pdf
    • https://cdn.shopify.com/s/files/1/0431/8026/1525/files/77127293114.pdf
    • https://cdn.shopify.com/s/files/1/0431/1249/7305/files/american_college_of_clinical_pharmacy.pdf
    • https://cdn.shopify.com/s/files/1/0439/1721/3864/files/html_to_npm.pdf
    • https://cdn.shopify.com/s/files/1/0429/7595/3049/files/19790658082.pdf
    • https://cdn.shopify.com/s/files/1/0435/2756/9576/files/faminuwoxoj.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_off00005315.bin
0b1c2c01d5795c9ed646dc61ce8283babdbcc8ff133ce41fde84796971242e1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x5315 5672 bytes
font_01_sfnt_off00006628.bin
bb4fa80d01fef7e5b3d7986660cd059a66a1bb13c4686dbbf964be8b59083611
pdf-font-stream PDF embedded font (sfnt) at offset 0x6628 11704 bytes