Malicious PDF — malware analysis report

Static analysis result for SHA-256 76d4577b2550ff73…

MALICIOUS

PDF

41.4 KB Created: 2020-08-06 15:34:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 98b66e4852ed45d58c712e70acc16529 SHA-1: 8dc29c9bb381ef1f31b70d18d4d032110f7c4d9e SHA-256: 76d4577b2550ff737fb004a1880cef12976b13ddd68ba204fd911173426b2e7b
154 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, with one specifically identified as a known malicious redirector. The document's structure suggests it's part of a link farm or SEO manipulation scheme, potentially leading users to malicious content or phishing sites. No scripts were extracted, but the presence of numerous external links and the malicious redirector indicates a high likelihood of malicious intent.

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=jurnal+keperawatan+anak+dengan+bronchopneumonia+pdf
    • http://files.triumphchew.com/uploads/1/3/1/6/131637570/5607441.pdf
    • http://files.harristonunited.com/uploads/1/3/1/8/131856195/7559764.pdf
    • http://files.nowlunenburgcounty.com/uploads/1/3/0/7/130775151/jibabutibamepag_mifaribuvano_gixajime_vebedozuz.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/79416915788.pdf
    • https://cdn.shopify.com/s/files/1/0437/2283/4071/files/15830609548.pdf
    • https://cdn.shopify.com/s/files/1/0427/8996/1884/files/90742333387.pdf
    • https://cdn.shopify.com/s/files/1/0430/8926/4794/files/togomuxaverebotimosegu.pdf
    • https://cdn.shopify.com/s/files/1/0433/0799/1208/files/82969509682.pdf
    • https://cdn.shopify.com/s/files/1/0437/9040/1687/files/formatar_hd_gpt.pdf
    • https://cdn.shopify.com/s/files/1/0432/9861/9557/files/muzikogazogew.pdf
    • https://cdn.shopify.com/s/files/1/0434/6665/3858/files/lipik.pdf
    • https://cdn.shopify.com/s/files/1/0431/0440/3613/files/73418161627.pdf
    • https://cdn.shopify.com/s/files/1/0438/6023/0294/files/character_sheet_template.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/vuwotowomezi.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_off00006346.bin
24c7cfc662da61c78443e2ee290893018945f06175c4bf7edae39e0953573701
pdf-font-stream PDF embedded font (sfnt) at offset 0x6346 5676 bytes
font_01_sfnt_off00007683.bin
7435fdffcaf8d5a08c76eea4da2d3f5e6138563f05e4ca2608bd6f63fffa0efd
pdf-font-stream PDF embedded font (sfnt) at offset 0x7683 9980 bytes