Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae3a70f9353b911a…

MALICIOUS

PDF

41.2 KB Created: 2020-09-01 03:16:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 140213b1061ec35d15d0c746c5dfcb3a SHA-1: 81ec58bf6b4f52678db7f08b3460d76e66ea9a15 SHA-256: ae3a70f9353b911a6521cf379e1205651046856df0e68494738a640b9005a087
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1200 Hardware Add-in T1059.001 PowerShell

The PDF file contains a large number of embedded external links, with a significant portion pointing to the static.usrfiles.com domain, which hosts numerous PDFs. One of these links, https://ttraff.com/wix?keyword=article+format+word, is identified as a known malicious redirector. This suggests the document is part of a link farm or SEO poisoning campaign designed to direct users to malicious content. The ML classifier also strongly indicated 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.com/wix?keyword=article+format+word
    • https://static.usrfiles.com/ugd/99a8f2_75ac7a3fe73841aea9a936629b4c81c2.pdf
    • https://static.usrfiles.com/ugd/80c1db_e31200b5eb7b4d42ab1b79da2464bf02.pdf
    • https://static.usrfiles.com/ugd/d775a9_b22bcf9a27484b17aa55ba9032cd6da8.pdf
    • https://static.usrfiles.com/ugd/40b9e6_1d7e8751f1704f7d93cbf380fe97e6d9.pdf
    • https://static.usrfiles.com/ugd/87a178_6d14268654a3431b9886d379080caa65.pdf
    • https://static.usrfiles.com/ugd/b27199_66f3013c5b65442e9c6a1ee94a342d84.pdf
    • https://static.usrfiles.com/ugd/b8c837_1b992f0aa23a459eaff00c249a340729.pdf
    • https://static.usrfiles.com/ugd/6cf392_76e9826a9d5349b5b0aaf9d04f3648cd.pdf
    • https://static.usrfiles.com/ugd/9757e7_be1c0ef8816c4030987c8ec086f3844c.pdf
    • https://static.usrfiles.com/ugd/2b25b5_fdea84722c634c9499a09946f9c13411.pdf
    • https://static.usrfiles.com/ugd/b8c837_ccf468dcf2bc49ac84922b3fc48405da.pdf
    • https://static.usrfiles.com/ugd/26481d_571860c5396a43169edbb5f91b1c9587.pdf
    • https://static.usrfiles.com/ugd/b0cd75_d716cf8652384aa0bdc677d477ba7e92.pdf
    • https://static.usrfiles.com/ugd/85d67f_988b3a8976c243b78aeb00eae2c5b45f.pdf
    • https://cdn.shopify.com/s/files/1/0428/9835/8432/files/vuvitew.pdf
    • https://cdn.shopify.com/s/files/1/0434/1301/2630/files/halloween_worksheets_coloring_pages.pdf
    • https://cdn.shopify.com/s/files/1/0431/1518/4277/files/limeka.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_off0000651f.bin
9b2d5ed0689cb4df76d49278dafa772d62ba93364d227a5912263c86d92428db		 pdf-font-stream PDF embedded font (sfnt) at offset 0x651F 5072 bytes
font_01_sfnt_off00007657.bin
59636a6a1fa3d5778a726328b08ba5c82d46cfe9097167903d35342fec211e86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7657 9912 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.