Malicious PDF — malware analysis report

Static analysis result for SHA-256 634da27357025795…

MALICIOUS

PDF

44.5 KB Created: 2020-08-30 00:17:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0efa544db09faabbdac4be893ea19c42 SHA-1: 39d99b5672977d79877bd78c1d79613723ad9cf8 SHA-256: 634da273570257958877afe92ad2cb15a21ac71aa1f5c2ceb4b933145d4d9885
154 Risk Score

Malware Insights

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

The PDF contains embedded links, with one identified as a malicious redirector. The document body, though heavily obfuscated, contains text related to medical discomfort and links to external PDFs, suggesting a lure for SEO spam or phishing. The presence of multiple external PDF links further supports the SEO spam angle.

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.me/wix?keyword=upper+stomach+discomfort+treatment
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/b8c837_58a4473bb4ab46d0961476458d3b1b43.pdf
    • https://static.usrfiles.com/ugd/d1d005_851ab943a81642e2bb37bb02665a1a77.pdf
    • https://static.usrfiles.com/ugd/b8c837_30c2c394a7de43c1b808a586a801eb80.pdf
    • https://static.usrfiles.com/ugd/b8c837_9e726f13ab8c42808e45e892aa7dce36.pdf
    • https://static.usrfiles.com/ugd/b8c837_2e736227da9c45b5bb0b3c9fcb3d05c2.pdf
    • https://static.usrfiles.com/ugd/3826db_21f67ce0155a4f9bacd8dfc42fa0130d.pdf
    • https://static.usrfiles.com/ugd/b8c837_a8de1a510741490685f51a983956bd75.pdf
    • https://static.usrfiles.com/ugd/ae059d_4771276090df46c9bbb89efb94eeef19.pdf
    • https://static.usrfiles.com/ugd/04e6f9_bfd5851cce814edca336941170b88b00.pdf
    • https://static.usrfiles.com/ugd/aff7ca_39357162dc58426b8fb1b5f7629c8191.pdf
    • https://static.usrfiles.com/ugd/834936_84b3b0931aca45a3b14f9e1322211b86.pdf
    • https://cdn.shopify.com/s/files/1/0437/0658/1147/files/aggiornamento_software_autoradio_android.pdf
    • https://cdn.shopify.com/s/files/1/0431/3019/2039/files/wijovedugirupu.pdf
    • https://cdn.shopify.com/s/files/1/0431/7259/3820/files/73869169304.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_off000070dd.bin
fcee157b2d840222bf2aaff47dc37a38171479eb800b94bd4b1c03cb4fb170d2
pdf-font-stream PDF embedded font (sfnt) at offset 0x70DD 5352 bytes
font_01_sfnt_off000082ec.bin
ee59809cdb0a6f12b6aa19c8901ca022c52a6e8d628db34dd5d85cab574edc22
pdf-font-stream PDF embedded font (sfnt) at offset 0x82EC 10208 bytes