Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e44177c3b81e97a…

MALICIOUS

PDF

45.7 KB Created: 2020-09-01 08:44:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 936d2d81151bde5ca14075ca46bc2176 SHA-1: a5bf2b5c1dd46fd07995dd0408ed4e4132017ea7 SHA-256: 7e44177c3b81e97a628803bf952d11bc380da3734d5a0f1425d833f6506741ad
154 Risk Score

Malware Insights

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

The PDF contains embedded URLs that redirect to malicious infrastructure, specifically a link farm designed to mimic search results. The primary malicious URL is a redirector that appears to be part of a SEO spam campaign. While no scripts were extracted, the PDF structure and embedded links strongly suggest a phishing or redirection attempt, likely delivered as a spearphishing attachment.

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.ru/wix?keyword=singer+sewing+machine+manual+pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0430/8716/7649/files/burejivuzuvitukovu.pdf
    • https://cdn.shopify.com/s/files/1/0439/2160/4763/files/cfa_level_2_notes.pdf
    • https://cdn.shopify.com/s/files/1/0430/0311/7719/files/xizulegozutilezisejud.pdf
    • https://cdn.shopify.com/s/files/1/0430/7720/6165/files/sequelize_eager_loading.pdf
    • https://static.usrfiles.com/ugd/455f95_3b0a337a34dc43048346ce3e926c3547.pdf
    • https://static.usrfiles.com/ugd/b8c837_6c74f14b5ba3450f8223cac2d058149f.pdf
    • https://static.usrfiles.com/ugd/b8c837_4c6641363833409b82816d758d0509e3.pdf
    • https://static.usrfiles.com/ugd/b8c837_ea274ce4b2c140c895b4c319e94a1caa.pdf
    • https://cdn.shopify.com/s/files/1/0431/0319/1193/files/86571158689.pdf
    • https://cdn.shopify.com/s/files/1/0440/6591/5045/files/convert_webpage_into_firefox.pdf
    • https://cdn.shopify.com/s/files/1/0457/0654/3260/files/chapelet_de_libration_en_vido.pdf
    • https://cdn.shopify.com/s/files/1/0430/5806/9655/files/jewulafubevejogirubobufag.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6066/files/49243007102.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_off00006646.bin
d45bef8a76ee1d4503bfd2c3282b28e6aaf755fd7647ecb381626dde4603dc25
pdf-font-stream PDF embedded font (sfnt) at offset 0x6646 5456 bytes
font_01_sfnt_off000078a6.bin
ef17c907fc5ae78405045cb37a204193682dc00aae9a8ab6a5e41dbfec0e6af1
pdf-font-stream PDF embedded font (sfnt) at offset 0x78A6 10316 bytes
font_02_sfnt_off00009bec.bin
05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176
pdf-font-stream PDF embedded font (sfnt) at offset 0x9BEC 4324 bytes