Malicious PDF — malware analysis report

Static analysis result for SHA-256 18143f43a2a70e5c…

MALICIOUS

PDF

55.4 KB Created: 2020-08-14 23:37:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 70e8b6909a5a4abb4a699974eb2096c0 SHA-1: b0d9e08e9988dad1431c413c691b9618494e127c SHA-256: 18143f43a2a70e5cc7cf360ee5c3aa6f95de07fb20a610229adf9fa66e1114da
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 benign Shopify domains, but one critical link redirects to a known malicious domain. This suggests a link farm or redirector strategy designed to obscure the ultimate malicious destination. 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.com/pify?keyword=objectives+of+material+requirement+planning+pdf
    • http://kuwip.whbaptist.org/uploads/1/3/1/6/131636668/zigebu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/2286/0966/files/jetabizugukid.pdf
    • https://cdn.shopify.com/s/files/1/0435/3658/0759/files/98929603245.pdf
    • https://cdn.shopify.com/s/files/1/0431/2812/7654/files/anlise_swot_planejamento_estratgico.pdf
    • https://cdn.shopify.com/s/files/1/0449/5455/0440/files/oil_and_gas_companies_in_ghana.pdf
    • https://cdn.shopify.com/s/files/1/0432/5598/8387/files/foxomudagepi.pdf
    • https://cdn.shopify.com/s/files/1/0435/1954/1416/files/pauli_neutrino_hypothesis_of_beta_decay.pdf
    • https://cdn.shopify.com/s/files/1/0435/6040/3103/files/18239982496.pdf
    • https://cdn.shopify.com/s/files/1/0430/2936/4885/files/chemistry_class_12_ncert_alcohols_phenols_and_ethers.pdf
    • https://cdn.shopify.com/s/files/1/0428/9947/2550/files/vurelomezelogexeveto.pdf
    • https://cdn.shopify.com/s/files/1/0431/9284/4448/files/60453390610.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_off00008a80.bin
e41d3755d484ffe1102be3e08c99e222522b94b625320a0f7b0226d8ce237dd7
pdf-font-stream PDF embedded font (sfnt) at offset 0x8A80 5784 bytes
font_01_sfnt_off00009e12.bin
a3fcce703e88cc329a4d7f92cbc8069ad5084cc1deea8f8db5ee0ab90ffae030
pdf-font-stream PDF embedded font (sfnt) at offset 0x9E12 10668 bytes
font_02_sfnt_off0000c284.bin
1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e
pdf-font-stream PDF embedded font (sfnt) at offset 0xC284 4324 bytes