Malicious PDF — malware analysis report

Static analysis result for SHA-256 321880d147e6aaef…

MALICIOUS

PDF

43.9 KB Created: 2020-10-18 04:17:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 2ba35d76744ab18df3987700922030de SHA-1: 5a22b868d15d526b76592226c23de71736d223bf SHA-256: 321880d147e6aaeff088b08f29f08f666826e25912596141f48ae7f6651ed4d9
154 Risk Score

Malware Insights

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

The PDF contains a malicious redirector link disguised as DVR instructions, aiming to lure users to a potentially harmful website. The PDF also hosts a link farm, suggesting an attempt to manipulate search engine results or distribute content across multiple domains. The ML classifier strongly indicated maliciousness, supporting the presence of a malicious redirector.

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/123?keyword=zosi+h264+hd+720p+dvr+instructions
    • https://cdn-cms.f-static.net/uploads/4369187/normal_5f88114ad4bc3.pdf
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f8748699ef01.pdf
    • https://cdn-cms.f-static.net/uploads/4366317/normal_5f872600527a3.pdf
    • https://cdn-cms.f-static.net/uploads/4369179/normal_5f87a1895bab7.pdf
    • https://kusanogiwaxug.weebly.com/uploads/1/3/0/8/130873987/xokori.pdf
    • https://xumabilere.weebly.com/uploads/1/3/1/1/131163638/zikavabedi.pdf
    • https://cdn-cms.f-static.net/uploads/4369905/normal_5f88b4e966cb8.pdf
    • https://cdn-cms.f-static.net/uploads/4380411/normal_5f8b501ce5adb.pdf
    • https://cdn-cms.f-static.net/uploads/4366406/normal_5f87bbb71590a.pdf
    • https://cdn-cms.f-static.net/uploads/4376086/normal_5f8b306a0cc9b.pdf
    • https://godadonalizubo.weebly.com/uploads/1/3/1/4/131437317/purigixajelupigeru.pdf
    • https://babinekisifuve.weebly.com/uploads/1/3/2/6/132696104/9e12e.pdf
    • https://lipowuripipu.weebly.com/uploads/1/3/1/3/131378852/1140105.pdf
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/2126607.pdf
    • https://fulipevaxavu.weebly.com/uploads/1/3/2/6/132695351/limadizade.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_off000068ec.bin
5bc225bd103fe225626b60912f3cd4560df462aaf33d59669ce27c900d9627a1
pdf-font-stream PDF embedded font (sfnt) at offset 0x68EC 5532 bytes
font_01_sfnt_off00007bcb.bin
fbf527697209e20468e8c7d803a62066497cffccc784454fd668d0b9c2261b69
pdf-font-stream PDF embedded font (sfnt) at offset 0x7BCB 12164 bytes