Malicious PDF — malware analysis report

Static analysis result for SHA-256 684b72d86eed9521…

MALICIOUS

PDF

43.3 KB Created: 2020-08-30 13:16:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5589256cf7b583e963ad6c253abe7748 SHA-1: 26cfeeef4b2c7b94c804eedbdf906f8bb334ef9c SHA-256: 684b72d86eed952129780d0327160c62361ae4ccbd7fbb18768f931ddcad4188
154 Risk Score

Malware Insights

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

The PDF contains embedded links that point to a redirector URL, which is flagged as malicious. It also functions as a link farm, hosting numerous other PDF files, likely for SEO poisoning or to distribute malicious content. The ML classifier strongly indicates maliciousness, and the presence of embedded URLs supports a phishing or redirection attack vector.

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/wix?keyword=l%2527+attacco+dei+giganti+manga+pdf+ita
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://cdn.shopify.com/s/files/1/0429/5108/2143/files/98844638805.pdf
    • https://cdn.shopify.com/s/files/1/0432/0041/3856/files/gonotaxutowinaweko.pdf
    • https://cdn.shopify.com/s/files/1/0437/0061/7381/files/antiderivatives_and_indefinite_integrals_worksheet.pdf
    • https://cdn.shopify.com/s/files/1/0429/4233/3087/files/42928802423.pdf
    • https://static.usrfiles.com/ugd/9d869b_7911e7bea35f4bfc959d92c3fa2d83d7.pdf
    • https://static.usrfiles.com/ugd/e2c250_4756461fc66b47fe9013c2ed45a1af7d.pdf
    • https://static.usrfiles.com/ugd/b8c837_0145bf18c102466d8f84fc9a9089e9d3.pdf
    • https://static.usrfiles.com/ugd/b8c837_44b0347737ab4394b3e02defa38c2303.pdf
    • https://cdn.shopify.com/s/files/1/0429/5013/1878/files/ruweduwikozupedidolubex.pdf
    • https://cdn.shopify.com/s/files/1/0461/6676/9827/files/ventajas_del_aprendizaje_colaborativo.pdf
    • https://static.usrfiles.com/ugd/48d9a1_e1262b800d5e4cfcbeae10e284b8e85e.pdf
    • https://static.usrfiles.com/ugd/ad2ade_2fbfddfaa6564d0a8ebc5fd74e2ef59f.pdf
    • https://static.usrfiles.com/ugd/b8c837_31acf244f30c48d9ba84016a7ceea100.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_off00006231.bin
77efbeb7fca94fd390d57bc8f95cb094ed87c2e1d7129a4cd765729f7e3843a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x6231 5144 bytes
font_01_sfnt_off000073ad.bin
fe8e9ec10c80e45c38b250a6fa4499cf69cedae29a88431a61f2bdee48bfa7b7
pdf-font-stream PDF embedded font (sfnt) at offset 0x73AD 14796 bytes