Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1f8efc31109e331…

MALICIOUS

PDF

50.5 KB Created: 2020-11-01 06:18:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65efa5ed541af621b15ec17c7714a3c7 SHA-1: 53115758791d5316c1e3896e11be8eec95290ca0 SHA-256: b1f8efc31109e33156e60cc84a957c27faa5b6c502edf4c4b00afb1d8e5e4419
154 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The document body text is garbled, but the presence of a product search term suggests a lure to disguise malicious links. The heuristic firings indicate the PDF is designed to redirect users to malicious infrastructure, likely for phishing or malware distribution.

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/123?keyword=philco+air+conditioner+remote+control
    • https://voletiga.weebly.com/uploads/1/3/4/5/134501602/8355816.pdf
    • https://jamuseramomuf.weebly.com/uploads/1/3/1/8/131871426/198c460007.pdf
    • https://gadigode.weebly.com/uploads/1/3/2/6/132680949/xagoxik-perufuvov.pdf
    • https://zizuralozirufu.weebly.com/uploads/1/3/1/4/131483034/kimiluninijedow.pdf
    • https://cdn-cms.f-static.net/uploads/4366665/normal_5f8feefec5da2.pdf
    • https://cdn-cms.f-static.net/uploads/4369189/normal_5f93539a3970b.pdf
    • https://tevumusavobe.weebly.com/uploads/1/3/4/1/134108657/bowuwos.pdf
    • https://cdn-cms.f-static.net/uploads/4370090/normal_5f93432f8186a.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://s3.amazonaws.com/susopuzupure/zirevokodijavozisejixuki.pdf
    • https://uploads.strikinglycdn.com/files/a2fdf203-d91b-4d0e-9e97-3361f5729ac4/dachshund_colors_black.pdf
    • https://s3.amazonaws.com/defujo/pediponufof.pdf
    • https://s3.amazonaws.com/norozovijalu/23421245390.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b42.bin
76d9a4e8d142f92f40052c2d3a8ed13b5912fc08bc36e8056839e466c78afdf9
pdf-font-stream PDF embedded font (sfnt) at offset 0x7B42 4788 bytes
font_01_sfnt_off00008b40.bin
e00edf2bd62ac9b13be486bf9ab91c154c2e5db0ebd1d347053f36fc3cb9c70f
pdf-font-stream PDF embedded font (sfnt) at offset 0x8B40 10568 bytes
font_02_sfnt_off0000af4f.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2
pdf-font-stream PDF embedded font (sfnt) at offset 0xAF4F 4324 bytes