Malicious PDF — malware analysis report

Static analysis result for SHA-256 02a90762d5f860d0…

MALICIOUS

PDF

71.9 KB Created: 2020-08-12 12:44:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e18b3adee1ed421ee6f8c7a2dc66e26d SHA-1: a7b8b94e866fd395f1137d11355bfe31718268c6 SHA-256: 02a90762d5f860d0897dc64e57688fce5a1fcd6a3a302adfddaa4d29f08ca3b7
154 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with one specifically identified as a malicious redirector. The document body, though heavily obfuscated, contains a URL that mirrors the malicious redirector. The ML classifier strongly indicated maliciousness, and the presence of a link farm suggests an attempt to distribute malicious content.

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=bible+study+topics+for+youth+pdf
    • http://baboza.scalarmanufacturing.com/uploads/1/3/0/7/130738732/0bc3c3f9.pdf
    • http://files.4quartercircles.com/uploads/1/3/0/9/130969352/1096323.pdf
    • http://files.kirkreview.com/uploads/1/3/1/3/131382470/9a981.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0438/0357/4434/files/fundamentals_of_agricultural_economics.pdf
    • https://cdn.shopify.com/s/files/1/0434/1039/1207/files/93049116819.pdf
    • https://cdn.shopify.com/s/files/1/0428/5258/1542/files/15588571942.pdf
    • https://cdn.shopify.com/s/files/1/0438/3234/4736/files/ciw_javascript_specialist_study_guide.pdf
    • https://cdn.shopify.com/s/files/1/0428/8059/8172/files/poveragudasunatu.pdf
    • https://cdn.shopify.com/s/files/1/0433/5009/8085/files/68928549003.pdf
    • https://cdn.shopify.com/s/files/1/0434/8385/7053/files/dalawaja.pdf
    • https://cdn.shopify.com/s/files/1/0452/0670/0183/files/jeliv.pdf
    • https://cdn.shopify.com/s/files/1/0431/8239/1451/files/4584945149.pdf
    • https://cdn.shopify.com/s/files/1/0430/3909/6986/files/1137557742.pdf
    • https://cdn.shopify.com/s/files/1/0436/2466/1154/files/fusazedof.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_off0000ca87.bin
9f5958f253a21ad732c811bbaa9da02254cd4fb074100a966abc9b09ba5df3d3
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA87 5324 bytes
font_01_sfnt_off0000dc92.bin
51ebeec29509b87aa858d500e37ac8853184703d07d1f913ce36d8e1dc7764c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC92 1800 bytes
font_02_sfnt_off0000e520.bin
af40c5dd94dcaef29b36c2501f685f188d5f56cb755a2cf48f17cb75a51f0fc4
pdf-font-stream PDF embedded font (sfnt) at offset 0xE520 14284 bytes