Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f9886b143f41f3b…

MALICIOUS

PDF

47.9 KB Created: 2020-08-22 22:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1fea91df0b265d0217a454e2a10b7f76 SHA-1: 2576d7f3b45f31e143dcc52be56b69cfef4f4089 SHA-256: 7f9886b143f41f3b9befffc915a1d57d12cc003cb5057bc8c3b3c7ce5efdb3ce
154 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with one specifically pointing to known malicious redirector infrastructure. The ML classifier also strongly indicated maliciousness. While no scripts were extracted, the presence of numerous links suggests an attempt to lure users to malicious sites, potentially for phishing or malware distribution.

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.cc/pify?keyword=democratic+centralism+pdf
    • http://files.joyfulsoundchoir.org/uploads/1/3/0/7/130738769/9229011.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0428/5923/3443/files/17919362093.pdf
    • https://cdn.shopify.com/s/files/1/0434/2264/6422/files/i_9_acceptable_documents_list.pdf
    • https://cdn.shopify.com/s/files/1/0434/2641/4749/files/81103816759.pdf
    • https://cdn.shopify.com/s/files/1/0429/2630/9543/files/barcos_que_vuelan_imprimir_gratis.pdf
    • https://cdn.shopify.com/s/files/1/0431/1416/8480/files/20670801288.pdf
    • https://cdn.shopify.com/s/files/1/0434/1612/5590/files/83567922850.pdf
    • https://cdn.shopify.com/s/files/1/0431/1102/2756/files/fenibilugefalusi.pdf
    • https://cdn.shopify.com/s/files/1/0433/3345/1944/files/2011_gmc_acadia_reviews_consumer_reports.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_off00007d95.bin
b77c0847456b76d135ece6578a9d839554845e1e2e9cc7efa70eae295050cc18		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7D95 5300 bytes
font_01_sfnt_off00008f7f.bin
efaf3757a9140380d9bc6682b97171e2858726d0809ba00a67680636869a40d2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8F7F 10376 bytes

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