Malicious PDF — malware analysis report

Static analysis result for SHA-256 93b193d4f5855baf…

MALICIOUS

PDF

38.5 KB Created: 2020-08-30 08:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f43f916c3a7bc71f4f8212b1c2a5acfe SHA-1: aef83bf679d3ec5d7951a89fa616670c784c039b SHA-256: 93b193d4f5855baf570e08c46557c2d4600ab06426f4ccce08394cc9f098400d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a link to a known malicious redirector, ttraff.cc, which is likely intended to lure the user to a malicious site. The document body, though heavily obfuscated, contains the same URL and text that appears to be a lure. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted from this sample.

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=lift+your+head+weary+sinner+lyrics
    • https://cdn.shopify.com/s/files/1/0435/6240/1947/files/67006308778.pdf
    • https://cdn.shopify.com/s/files/1/0434/2130/2935/files/41466164112.pdf
    • https://cdn.shopify.com/s/files/1/0431/3343/6055/files/alice_in_wonderland_coloring_book.pdf
    • https://cdn.shopify.com/s/files/1/0463/2618/6141/files/instagram_pc_windows_xp.pdf
    • https://static.usrfiles.com/ugd/ea5d7b_5fff22c0f1ce4949a7799e22131c7f9e.pdf
    • https://static.usrfiles.com/ugd/95089d_64f6b7d19e4547d1a8f33804ed14367d.pdf
    • https://static.usrfiles.com/ugd/b8c837_505abca3aef8406ab29fe075d84f84b2.pdf
    • https://static.usrfiles.com/ugd/b8c837_9358bfa3497f4f10bf673070819bcb76.pdf
    • https://static.usrfiles.com/ugd/b8c837_7c92dc5782b14e0b80868bdc27535de6.pdf
    • https://static.usrfiles.com/ugd/724bd4_47620f2856854917bd6139b67105c4b7.pdf
    • https://static.usrfiles.com/ugd/405339_3a049afdcdf949018d43f4f5ac4ebec9.pdf
    • https://static.usrfiles.com/ugd/b8c837_ef6a5554ca4744a995576b1ca1b073ef.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_off0000591b.bin
058623b49726e5e6280506672735cd1cda57a42517f7c719833072102968f044		 pdf-font-stream PDF embedded font (sfnt) at offset 0x591B 5244 bytes
font_01_sfnt_off00006b08.bin
9e285c54bb7c15a9e0680de6316af83260612ccb438fafd7fe417f8d979ca419		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6B08 10112 bytes

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