Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd3904628db26ca…

MALICIOUS

PDF

45.5 KB Created: 2020-09-05 16:11:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f246ad37bbc75ae99244c21c07079fcb SHA-1: 364509351150df3dff0e7f9ce84002c519850beb SHA-256: 6fd3904628db26ca9261572c77b394b461e763c5de2e820e4be97dc4cd732ab3
154 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains a URL that appears to be a lure for photography composition guidelines. The ML classifier also flagged this PDF as malicious with high confidence.

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.club/wix?keyword=photography+composition+guidelines
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://static.usrfiles.com/ugd/e8e253_243168a1c6d5445b821abe8c8c6de71b.pdf
    • https://static.usrfiles.com/ugd/451a43_2cdd6133c4974c23bc421afb31238e61.pdf
    • https://static.usrfiles.com/ugd/6cf392_5db97e145869467fbcdf85f8450ed118.pdf
    • https://static.usrfiles.com/ugd/906e9f_f506d887204c4141a52f8c48cc6f08f3.pdf
    • https://static.usrfiles.com/ugd/b972d5_602094f91c5d45de98099ea5eb012598.pdf
    • https://cdn.shopify.com/s/files/1/0435/4477/2759/files/wubugal.pdf
    • https://cdn.shopify.com/s/files/1/0429/9954/6010/files/ergopouch_sleeping_bag_temperature_guide.pdf
    • https://cdn.shopify.com/s/files/1/0464/6145/2440/files/texarakezuzugamugeb.pdf
    • https://cdn.shopify.com/s/files/1/0428/9455/7347/files/atapi_vatapi_full_episode.pdf
    • https://cdn.shopify.com/s/files/1/0432/5235/1144/files/tepuxugexed.pdf
    • https://static.usrfiles.com/ugd/b8c837_5bdb69c9859f41878e8daa0600737776.pdf
    • https://static.usrfiles.com/ugd/f80014_622968bbe72e47e1ab1639f6fe103cf6.pdf
    • https://static.usrfiles.com/ugd/dd6616_f66bf45b77284b38b635bd6c6dc986fe.pdf
    • https://static.usrfiles.com/ugd/10a4aa_189f28dd70c24800a9ee44a240c4d06f.pdf
    • https://static.usrfiles.com/ugd/ecec20_57f222b151484428aa30ebacea86cfbb.pdf
    • https://static.usrfiles.com/ugd/48d9a1_5510a00040d645288408e55eb92ef32a.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_off00007316.bin
37a04d0dcacc2462ab62e622ce3369e3b2e0d75d5e330f4c24c2545138392df3
pdf-font-stream PDF embedded font (sfnt) at offset 0x7316 5588 bytes
font_01_sfnt_off000085f1.bin
3d2cd80267bf184672e3de516152186f10865a32f0ba8e1bde22efc834ebed60
pdf-font-stream PDF embedded font (sfnt) at offset 0x85F1 10316 bytes