Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dd4d156818fbe96…

MALICIOUS

PDF

52.1 KB Created: 2020-08-30 00:31:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7b2d7973149899add170e35a6e6359d1 SHA-1: d7ccfc31da7799b74f73e667a7265a6c46596061 SHA-256: 5dd4d156818fbe9623c3b9f7a177f575f4db3e5a4a0ab9a4746b59123227358f
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link to a known malicious redirector, disguised with a search query related to 'Stardew Valley'. This suggests a phishing or malware distribution attempt, leveraging a common lure. The presence of numerous other PDF links further indicates a link farm designed to obscure the malicious destination.

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=stardew+valley+lehm+finden
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/14981909947.pdf
    • https://cdn.shopify.com/s/files/1/0427/3196/2535/files/lojovabedinewaj.pdf
    • https://cdn.shopify.com/s/files/1/0431/5096/6950/files/61934455399.pdf
    • https://static.usrfiles.com/ugd/253000_13c1fb94a1914145b0476b3bf85a6e44.pdf
    • https://static.usrfiles.com/ugd/b8c837_00b3d5b5938c44d1b04ac96dc5199399.pdf
    • https://static.usrfiles.com/ugd/2f8cea_dc36c8989596495faa6b4803338973fb.pdf
    • https://static.usrfiles.com/ugd/b8c837_c817e777ffad4352919e13822e8f704a.pdf
    • https://static.usrfiles.com/ugd/b8c837_adf2ac53552b41a4b979e46e9bfcefbb.pdf
    • https://static.usrfiles.com/ugd/b8c837_8801f67e37f84cefb3a1839db9e3e676.pdf
    • https://static.usrfiles.com/ugd/9757e7_7e2d66aa45304c1481631673abbb79cc.pdf
    • https://cdn.shopify.com/s/files/1/0462/2601/4362/files/22644904344.pdf
    • https://cdn.shopify.com/s/files/1/0440/9311/2472/files/bad_acronym_meme.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_off00007fe4.bin
3e3a5460840155b791525342ce7c68aaca8cd352775065e3959436d7ffb55ac1
pdf-font-stream PDF embedded font (sfnt) at offset 0x7FE4 5004 bytes
font_01_sfnt_off000090c8.bin
ee7e2d87f75a035e89742a1ea7d74e843127c5a68acee58fb9b49de8d4f075dd
pdf-font-stream PDF embedded font (sfnt) at offset 0x90C8 11348 bytes
font_02_sfnt_off0000b5c8.bin
0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
pdf-font-stream PDF embedded font (sfnt) at offset 0xB5C8 4324 bytes