Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1b0c520b4349581…

MALICIOUS

PDF

55.7 KB Created: 2020-07-08 21:09:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb703a5b9d39a64e93dbf01b7b3572a0 SHA-1: 21d2e8277643175d1a57d2158c5dadce6ac64216 SHA-256: e1b0c520b4349581b1bfaa120f0465124da9edbc0d51eb7509a439b43b1393af
154 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to external resources. One prominent link, https://ttraff.cc/wb?keyword=livro%20libertinagem%20pdf%20gratis, is flagged as malicious by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text related to 'livro libertinagem pdf gratis', suggesting a lure to entice users to click the malicious link. The ML classifier also strongly indicates 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.cc/wb?keyword=livro%20libertinagem%20pdf%20gratis
    • http://files.quantumpoint.org/uploads/1/3/0/8/130874031/fexurugomaseba_livorejalolokib_kuluvewowa.pdf
    • http://files.grcrowfamily.com/uploads/1/3/1/0/131070190/3426f7e.pdf
    • http://files.ratchfordrealestate.ca/uploads/1/3/0/9/130969775/dupunatotazosot-masavimudane-zapovalipav.pdf
    • http://files.morroandjasp.com/uploads/1/3/0/9/130969375/wojerodijudo.pdf
    • http://files.burnetcountyhighlandlakesmastergardener.org/uploads/1/3/1/4/131438150/da4ccc942.pdf
    • http://files.skindeepinktattoo.com/uploads/1/3/1/3/131398367/worep_jebulor_sagudufozerodam.pdf
    • http://files.southbridgeboathouse.com/uploads/1/3/1/1/131163957/f9312df57477b63.pdf
    • https://kibufolawof.files.wordpress.com/2020/06/pupebowit.pdf
    • https://lonepeson.files.wordpress.com/2020/06/zosibiwulirir.pdf
    • https://xigajidag.files.wordpress.com/2020/07/leziwuxe.pdf
    • https://rujolafuw.files.wordpress.com/2020/06/65325883000.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/89709194360.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/62114329075.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/welilavuruwad.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/puneson.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/31968244380.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/sosivizugepu.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_off0000944e.bin
2f6734c02d0145d05b86f1455c856ae3eacfe12414a2bd4365a8c7468a9762b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x944E 5288 bytes
font_01_sfnt_off0000a62f.bin
8b059720f55210775651c93c6aa109d7cc6299723a8482585686ac69b193274f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA62F 14292 bytes

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