Malicious PDF — malware analysis report

Static analysis result for SHA-256 889d5a3eb9ae65a4…

MALICIOUS

PDF

40.9 KB Created: 2020-08-30 06:27:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d4a033e52403f2e8c1c76267d9f2015b SHA-1: 7d911dda93231277b907f9c1d5667fe30ee3be75 SHA-256: 889d5a3eb9ae65a4e5ea4ac21b445c17373262d8795e43ca20907e70ac4b56bd
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell T1204.002 Malicious Link

The PDF contains a link farm and a direct link to a known malicious redirector, https://ttraff.com/wix?keyword=dispositivos+de+expansi%25C3%25B3n+de+redes. This suggests the document's primary purpose is to redirect users to malicious infrastructure. The ML classifier strongly supports this assessment. No scripts were extracted, limiting the analysis of further stages.

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=dispositivos+de+expansi%25C3%25B3n+de+redes
    • https://static.usrfiles.com/ugd/b56239_2769a77b54794a3790e46217d678a42b.pdf
    • https://static.usrfiles.com/ugd/b8c837_161ab6fb037247e781f9f91ce5671a02.pdf
    • https://static.usrfiles.com/ugd/9f6a24_83669610821c43db9f91279a6c80d573.pdf
    • https://static.usrfiles.com/ugd/b8c837_03469f8f1a1c4133900d943862dac300.pdf
    • https://static.usrfiles.com/ugd/d5d855_82271cc51d574ed79d334d0befd09d2e.pdf
    • https://cdn.shopify.com/s/files/1/0448/8983/3639/files/capsim_guide.pdf
    • https://static.usrfiles.com/ugd/5ed537_3456089e34704a869c616d5fdb9eef66.pdf
    • https://static.usrfiles.com/ugd/868401_b60a53b672b140789bc840027f10c4b4.pdf
    • https://static.usrfiles.com/ugd/4b68be_6a86d848e8954abb98c9728fd12d4091.pdf
    • https://static.usrfiles.com/ugd/5be868_02caed0a61274d84b17c64a8b8423b42.pdf
    • https://static.usrfiles.com/ugd/39cb9d_bf052a1fb6824ed59ed4a50e84392230.pdf
    • https://static.usrfiles.com/ugd/b8c837_407ae5d3df014a7ea237ce441e1e32eb.pdf
    • https://static.usrfiles.com/ugd/764aaa_df4530ba67c14d73b4aa6a8b757266e4.pdf
    • https://static.usrfiles.com/ugd/eb4c03_9099d2e65c794456828705ac1eff5d4b.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_off0000603d.bin
3ffa823ab4c9cba006471b8ae70de6bd65f9da61af8ae9c5390e101712a0e8d8
pdf-font-stream PDF embedded font (sfnt) at offset 0x603D 5184 bytes
font_01_sfnt_off000071b1.bin
f16419896ec14446d7ae35bd3d258d793f9c331e411ad401b24af63c004cf4bb
pdf-font-stream PDF embedded font (sfnt) at offset 0x71B1 10700 bytes