Malicious PDF — malware analysis report

Static analysis result for SHA-256 b27bbdfa60cd4e39…

MALICIOUS

PDF

43.4 KB Created: 2020-08-09 16:10:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1ea8f129bd9bd5eaa9ed0ddb4748e916 SHA-1: 5fe875e9e874e9452142f9160104c6add2384162 SHA-256: b27bbdfa60cd4e396c732065739155a5e82dc9270e114b5614de631fbb272589
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, characteristic of a link farm designed to manipulate search engine results or distribute malicious content. One of these links, https://ttraff.cc/pify?keyword=starting+a+business+with+no+money+pdf, is identified as a known malicious redirector. The ML classifier strongly supports the malicious nature of this PDF.

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=starting+a+business+with+no+money+pdf
    • http://files.resonantmoon.com/uploads/1/3/2/7/132740804/6684719.pdf
    • http://files.saintpaulcatholicchurchpocahontas.com/uploads/1/3/2/8/132815123/bf55bb5f.pdf
    • http://files.lifemowercounty.org/uploads/1/3/2/6/132681910/738e4d3c74.pdf
    • http://files.annapicklesharvey.com/uploads/1/3/1/4/131438427/6022432.pdf
    • https://cdn.shopify.com/s/files/1/0437/9194/1781/files/77965818115.pdf
    • https://cdn.shopify.com/s/files/1/0433/9033/7189/files/befegurazikikomibolok.pdf
    • https://cdn.shopify.com/s/files/1/0428/2882/4742/files/circulatory_system_parts_and_their_functions.pdf
    • https://cdn.shopify.com/s/files/1/0432/8154/7424/files/3128819414.pdf
    • https://cdn.shopify.com/s/files/1/0440/8918/0310/files/encyclopedia_magica_volume_2.pdf
    • https://cdn.shopify.com/s/files/1/0433/8860/0478/files/tekufodoz.pdf
    • https://cdn.shopify.com/s/files/1/0430/9165/6864/files/65976698774.pdf
    • https://cdn.shopify.com/s/files/1/0437/5196/4830/files/3283723229.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/52299098946.pdf
    • https://cdn.shopify.com/s/files/1/0428/3367/4396/files/nuxadibebitufaxoriruvixo.pdf
    • https://cdn.shopify.com/s/files/1/0434/7471/4790/files/school_budget_planning.pdf
    • https://cdn.shopify.com/s/files/1/0430/6285/3794/files/54306174671.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_off00006b20.bin
7aea41873a58756e6bff51a28c8d3ea45246075aa7b1f9171ae020059ae953f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6B20 5860 bytes
font_01_sfnt_off00007ef5.bin
0c22a82433b5f3d05949ec7942762eb21c3f4db306cb1eafabc4d1d87289af9c
pdf-font-stream PDF embedded font (sfnt) at offset 0x7EF5 9936 bytes