Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5ef358c526c32b…

MALICIOUS

PDF

41.8 KB Created: 2020-08-07 14:28:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: aed110a6723738c2e07238ee14ae0901 SHA-1: 8c91b0d0bffedcd5de8c41601cfc17bc4b15535a SHA-256: 5c5ef358c526c32b68be57dcd8b50c773c2be175645b2b924b2a3ae1b1c8561e
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded links, many of which point to Shopify-hosted PDFs, forming a link farm. One of the primary links directs to a known malicious redirector, suggesting an attempt to lead users to malicious content. The ML classifier also strongly indicated maliciousness.

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=astm+d445+15+pdf
    • http://files.organicpricezone.com/uploads/1/3/1/1/131164125/4294991.pdf
    • http://files.5puntocero.net/uploads/1/3/2/3/132303270/zerolasipo.pdf
    • http://files.tusgart.com/uploads/1/3/2/6/132695329/2459011.pdf
    • http://files.permittedtopause.co.uk/uploads/1/3/0/9/130969580/puguvoma-sozilawil.pdf
    • http://files.createhealingreiki.com/uploads/1/3/0/7/130739308/nosimokupakokeva.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0431/9825/1165/files/rodavozupiripena.pdf
    • https://cdn.shopify.com/s/files/1/0430/0357/6481/files/27038506534.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/rusifufis.pdf
    • https://cdn.shopify.com/s/files/1/0430/0976/9631/files/tommy_nelson_songs_of_solomon.pdf
    • https://cdn.shopify.com/s/files/1/0431/7865/5903/files/saxejojesisowu.pdf
    • https://cdn.shopify.com/s/files/1/0431/4664/1570/files/tawazuteraw.pdf
    • https://cdn.shopify.com/s/files/1/0432/0965/4434/files/76746245084.pdf
    • https://cdn.shopify.com/s/files/1/0450/2195/4206/files/plants_worksheets_for_grade_3.pdf
    • https://cdn.shopify.com/s/files/1/0427/6341/9815/files/viwop.pdf
    • https://cdn.shopify.com/s/files/1/0429/9977/5381/files/tededuf.pdf
    • https://cdn.shopify.com/s/files/1/0433/9613/7111/files/lowaxorizofupotomumefu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/19194700937.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_off000067d2.bin
1021628af75d350b2f89f40c37e1e3a261a9a1118d936929c5ba201aaaa493b4
pdf-font-stream PDF embedded font (sfnt) at offset 0x67D2 5104 bytes
font_01_sfnt_off00007935.bin
8c96bca78c05f6761e897f85a78318df7ac27cd8c15150719d5eb2807dfa8f3c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7935 9892 bytes